Why do we need to sleep?

2006-04-13 9:24 pm

回答 (89)

2006-04-13 9:25 pm
✔ 最佳答案
To get more energy. If you don't you will get in Sleep debt. Also your brain, reflexes, and body would not do as good. When you are in sleep debt you have to sleep more to get back on track. Also the recommended hours of sleep are 8 to 9 hours.

For kids they need 10 to 11 hours of sleep.
Also Dr. Know (from TV) did tests on a lab rat (Not a rat but a human) by forcing them to only get 4 hours of sleep each night and did a test a found out their reflexes were slowing, their memory test wasn't as good, and when they recovered (pay their sleep debt) they did better.
參考: Dr. Know
2006-04-20 5:45 pm
Because our brain need to be rest after several hours of working.
2006-04-20 3:33 pm
because it's fun =)
2006-04-19 5:52 am
You need REM stage sleep, rapid eye movement, that's when you dream. You may not remember your dreams but your brain really needs them. Your body gets enough rest by just laying there but if you don't go through the 4 stages of sleep you start hallucinating, jumping at the slightest thing and can't function at work. I have severe insomnia and sleep apnea and don't sleep for weeks at a time. It's nasty.
2006-04-18 11:19 am
who cares
2006-04-17 9:39 pm
I believe that you need sleep in order to rest your body and mind so that it is able to function the next day.
2006-04-14 11:39 pm
I dunno. All I know is sleep is stupid. I hate sleep. I would love to stay awake for my whole life.
2006-04-14 1:07 am
We need sleep, because it energizes us.
2006-04-13 10:07 pm
At the time our body works, we use energy, some kinds of energy maintain the ability to move our body, some kinds of energy maintain the ability to use our brain on thinking.

As all we need to eat, eating supples some of energy, sunshine supplies Vitamin D.....And Sleep helps to maintain our concentration and judgement to make sure we have ability to detect danger around us.

Sleeping is the time to reproduce our brain cell, most of the body function will be reduced(our heartbeat becomes slower when we fall in sleep), only keep the lowest level of alarm to detect danger. Brain can focus to produce new brain cells to keep our body living when we get up, our body (including organs) needs lots of brain cells to transfer message through brain.

So that if we don't sleep or poor quality of our sleeping, it effects our concentration and judgement even our organs can't work properly.
2006-04-13 9:43 pm
so you can rest,and also when you are still growing its the time when your body does grow.
2006-04-13 9:42 pm
I think there are two ways to answer this question. 1) On a biological level, it serves as a way of recuperating and resetting everything. Your body can allocate it's ressources more effectively to heal and what not while you are not active, or asleep.

2) The obvious answer is: Try not sleeping. Scary things happen to you if you are deprived of sleep for more than 24 hours. You could expect to get really horny, followed by getting serious munchies, followed by hallucination, and then you start to pass out.

You will fall asleep before you die of sleep deprivation btw. The NIH pays top dollar for people willing to do sleep deprivation studies. I know a guy that got through college by letting the NIH keep him up for three days with no sense of what time or day it was. He isn't very well adjusted mind you.
2006-04-13 9:41 pm
First of all it's to regain homeostasis. Within the first 15 minutes or so the body will regain it's balance. The rest of the time it is good to dream and helps with focusing, and of of course keeping you healthy.
2006-04-13 9:41 pm
No one knows for sure why we sleep, but here are 2 basic theories:

Sleep has a restorative function.
Sleep has an adaptive function.
Sleep as a Restorative Process
This theory of sleep suggests that sleep helps the body recover from all the work it did while an animal was awake. Experiments have shown that the more physical exercise an animal does, the more SWS an animal will have. Also, if people are deprived of SWS by waking them up each time they get to stage 4 sleep, then they complain of being physically tired. If people are deprived of REM sleep by waking them up each time the have REM type EEG patterns, they can get anxious and irritable. If animals are deprived of REM for several days and then allowed to get an undisturbed period of sleep, animals will go into "REM rebound" - this is when REM periods of sleep will happen more often and for a longer time than normal.
Sleep, especially REM sleep, has also been thought to be important for memory and learning. It is possible that sleep helps form memories.


Sleep as an Adaptive Process
Sleep may have developed because of a need of animals to protect themselves. For example, some animals search for food and water during the day because it is easier to see when the sun is out. When it is dark, it is best for these animals to save energy, avoid getting eaten, and avoid falling off a cliff that they cannot see. It is interesting to note which animals sleep the most and which sleep the least. In general, animals that serve as food for other animals sleep the least.
2006-04-13 9:41 pm
So we do not die of exaustion or go insain
2006-04-13 9:41 pm
If you do not get enough sleep this will harm your body, memory, and any other ability to focus, or do anything properly... Your body will not allow you not to sleep.. believe me... your body will shut down and make you sleep, with pills or not its just a matter of time before it burns you out enough.. on another note... sleep is food for the body brain and soul.... there fore its needed to do everything you need to do more officiate...
2006-04-13 9:41 pm
Wow, Sean (by the way Sean is the Gaelic or Celtic spelling of John) you certainly got quite a few answers, some sarcastic and some scientific and I am certain that you are impressed as I am by the amount of Yahoo people out there who took your question to heart. Of course they all had some opinion of why we need sleep but none of them were correct, the correct answers are:

In order to wake up

To dream of Paris Hilton

To dream of Cher

To dream of Brittany Spears

To fantasize about winning the lottery

To wake up with a "woody"

To have "wet dreams"

To toss and turn

To provide funds for the mattress companies who say they can get us a better sleep????

To dream of that 'new car'

To dream of your neighbors wife (you bad boy you)

To snore (best part of sleep)


Anyhow, those are the main reasons for sleep there are plenty more, but Yahoo does not like you to take up too much space, so forget the science, forget the sarcasm just go to sleep and sweet dreams.
2006-04-13 9:41 pm
to re-energize
2006-04-13 9:41 pm
When sleep so our brain can rest and make sense of all of the data we take in. Also the body need to do the necessary repair to keep everything run smoothly. I read several report about sleep deprivation. In the experiment our learning capability drop way down when we go sleepless. I guess we need our beauty sleep to stay alive.
2006-04-13 9:40 pm
I guess so we can grow and gain energy.
2006-04-13 9:40 pm
becasue the human brain gets stressed out... thus to ease that stress we need to sleep
2006-04-13 9:40 pm
to recharge our bodies
2006-04-13 9:40 pm
this is a myth i have went 2 years now without sleep and feel fresh. It aint a problem, try it and you'll be suprised how easy it is.
2006-04-13 9:39 pm
Because its fun to sleep, and so you don't have to do chores
2006-04-13 9:39 pm
We need to go to sleep because if we don't, people can get real cranky and their brains won't work. Whenever you do go to sleep, your brain starts to relax and before you know it, the next day, your brain will be Albert Einstein!
2006-04-13 9:39 pm
to give our bodies a chance to regain engery, to rest.
2006-04-13 9:38 pm
Chuck Norris doesnt sleep...he just waits for another kill
2006-04-13 9:38 pm
Because if you don't, you'll fall over.
2006-04-13 9:38 pm
Because if we didn't sleep, we'd be tired, Bush would fall asleep and fall on a button that launches nuclear missles, we'd end up hitting Russia, they'd ally with some terrorists, we'd ally with some other people and nuke the crap out of each other, and it'd be the end of the world as we know it. Yup.
參考: My sick mind.
2006-04-13 9:37 pm
so that your body can relax, have time to re coop for the next day.. so that your body functions properly
參考: partying while in college
2006-04-13 9:37 pm
dolphins don´t need to sleep. the left part of brain sleeps half of the day, then the other part sleeps.
2006-04-13 9:37 pm
ok for everyone out there who thinks sleep is for rest, is WRONG! the only reason you sleep is because your brain needs to process the days information. this happens when you dream. by dreaming, your brain rids itself of all the pointless information it has gathered through the day, and processes the information you need to keep. you do not need sleep to obtain rest, but you need sleep to process the information. it just so happens that when you sleep, you also rest.
2006-04-13 9:37 pm
To have energy to do stuff.
2006-04-13 9:37 pm
The cycle of sleep and wakefulness is regulated by the brain stem, thalamus, external stimuli, and various hormones produced by the hypothalamus. Some neurohormones and neurotransmitters are highly correlated with sleep and wake states. For example, melatonin levels are highest during the night, and this hormone appears to promote sleep. Adenosine, a nucleoside involved in generating energy for biochemical processes, gradually accumulates in the human brain during wakefulness but decreases during sleep. Researchers believe that its accumulation during the day encourages sleep. The stimulant properties of caffeine are attributed to its negating the effects of adenosine.

The suprachiasmatic nucleus (SCN) of the hypothalamus plays an important role in the regulation of circadian rhythms. The SCN is influenced by external light and also generates its own rhythm in isolation. In the presence of light it sends messages to the pineal gland that instruct it to cease secreting melatonin.

Thus, three processes, each influenced by hormonal, neurological, and environmental factors, underlie sleep regulation:

A homeostatic process determined by prior sleep and wakefulness, determining "sleep need".
A circadian process determining periods of high and low sleep propensity, and high and low rapid eye movement (REM) sleep propensity.
An ultradian process
The interrelationships and relative importance of each process and system remain uncertain.

Non-REM sleep (NREM), accounts for 75-80% of total sleep time:
Stage 1, with near-disappearance of the alpha waves seen in awake states, and appearance for the first time of theta waves. The stage is sometimes referred to as somnolence, or "drowsy sleep". It appears at sleep onset (as it is mostly a transition state into Stage 2), and can be associated with so-called hypnagogic hallucinations. In this period, the subject loses some muscle tone, and conscious awareness of the external environment: Stage 1 can be thought of as a gateway state between wake and sleep.
Stage 2, with "sleep spindles" (12–16 Hz) and "K-complexes". The EMG lowers, and conscious awareness of the external environment all but disappears. This occupies 45-55% of total sleep.
Stage 3, with delta waves, also called delta rhythms (1–2 Hz), is considered part of slow-wave sleep (SWS) and functions primarily as a transition into stage four. Overall it occupies 3-8% of total sleep time.
Stage 4 is true delta sleep. It predominates the first third of the night and accounts for 10-15% of total sleep time. This is often described as the deepest stage of sleep; it is exceedingly difficult to wake a subject in this state. This is the stage in which night terrors and sleepwalking occur.
Stage 5, or Rapid eye movement (REM) sleep, associated with dreaming, especially bizarre, visual, and seemingly random dreams. REM sleep is predominant in the final third of a sleep period, its timing linked to circadian rhythm and body temperature. The EEG in this period is aroused and looks similar to stage 1, and sometimes includes beta waves.

Sleep proceeds in cycles of NREM and REM phases. In humans, the cycle of REM and NREM is approximately 90 minutes. Each stage may have a distinct physiological function. Drugs such as alcohol and sleeping pills can suppress certain stages of sleep (see sleep deprivation below). This can result in a sleep that exhibits loss of consciousness but does not fulfill its physiological functions.

Each sleep stage is not necessarily uniform. Within a given stage, a cyclical alternating pattern may be observed.
參考: Failure to sleep results in progressively severe psychological and physical distress.
2006-04-13 9:36 pm
if we dont sleep we will have no energy or we will be really tired
2006-04-13 9:36 pm
to rest your body
2006-04-13 9:36 pm
because we are human and that's all
2006-04-13 9:35 pm
Restorative theories of sleep describe sleep as a dynamic time of healing and growth for organisms. For example, during stages 3 and 4, or slow-wave sleep, growth hormone levels increase, and changes in immune function occur. The myriad illnesses associated with sleep deprivation testify to its restorative function.

According to the ontogenetic hypothesis of REM sleep, the activity occurring during neonatal REM sleep (or active sleep) seems to be particularly important to the developing organism (Marks et al., 1995). Studies investigating the effects of deprivation of active sleep have shown that deprivation early in life can result in behavioral problems, permanent sleep disruption, decreased brain mass (Mirmiran et al. 1983), and an abnormal amount of neuronal cell death (Morrissey, Duntley & Anch, 2004). Given sleep's heterogeneous nature, however, no single theory predominates, as it is difficult to describe one single "function" of sleep.

One process known to be highly dependent on sleep is memory. REM sleep appears to help with the consolidation of spatial and procedural memory, while slow-wave sleep helps with the consolidation of declarative memories. When experimental subjects are given academic material to learn, especially if it involves organized, systematic thought, their retention is markedly increased after a night's sleep. Mere rote memorization is retained similarly well with or without an intervening period of sleep.

Non-REM sleep is an anabolic state marked by physiological processes of growth and rejuvenation of the organism's immune, nervous, muscular, and skeletal systems. Sleep also restores neurons and increases production of brain proteins and certain hormones. Wakefulness may perhaps be viewed as a cyclical, temporary, hyperactive catabolic state during which the organism acquires nourishment and procreates. Also, during sleep, an organism is vulnerable; when awake it may percieve and avoid threats. Asking the question "Why do we awaken?" instead of "Why do we sleep?" yields a different perspective toward understanding how sleep and its stages contribute to a healthy organism.

One view, "Preservation and Protection", is that sleep serves an adaptive function. It protects the individual during that portion of the 24-hour day in which being awake, and hence roaming around, would place the individual at greatest risk. Organisms don't require 24 hours to feed themselves and meet other necessities. From this perspective of adaptation, organisms are safer by staying out of harm's way where potentially they could be prey to other stronger organisms. They sleep at times that maximizes their safety, given their physical capacities and their habitats. (Allison & Cicchetti, 1976; Webb, 1982).

Another view is that the function of sleep is for memory processing. This theory argues that saving memory directly into the long-term memory is a slow and error prone process, and, thus, proposes that the memory formed during waking time is not saved directly into the long-term memory; instead it is saved into a temporary memory store first. The function of sleep is to process, encode and transfer the data from the temporary memory store to the long-term memory store. (Zhang, 2004).

Recent research suggests that sleep patterns vary significantly across cultures. [1] The most striking differences are between societies that have plentiful sources of artificial light and ones that do not. The primary difference appears to be that pre-light cultures have more broken up sleep patterns. For example, people might go to sleep far more quickly after the sun sets, but would then wake up several times throughout the night, punctuating their sleep with periods of wakefullness, perhaps lasting several hours. The boundaries between sleeping and waking are blurred in these societies. Some observers believe that sleep in these societies is most often split into two main periods, the first characterised primarily by "slow sleep" and the second by REM sleep. This is called segmented sleep, which led to expressions such as "first sleep" "watch" and "second sleep" which appear in literature from all over the world in pre-industrial societies.

Some societies display a fragmented sleep pattern in which people sleep at all times of the day and night for shorter periods. For example, many Mediterranean societies have a siesta, in which people sleep for a period in the afternoon. In many nomadic or hunter-gatherer societies people will sleep off and on throughout the day or night depending on what is happening.

Plentiful artificial light has been available in the industrialised west since at least the mid-nineteenth century, and sleep patterns have changed significantly everywhere that lighting has been introduced. In general people sleep in a more concentrated burst through the night, and sleep much later, although this is not always true.

In some societies people generally sleep with at least one other person, often many, or with animals. In others people rarely sleep with anyone but a most intimate relation such as a spouse. In almost all societies sleeping partners are strongly regulated by social standards. For example, people might only sleep with their immediate family, extended family, spouses, with their children, with children of a certain age, children of specific gender, peers of a certain gender, friends, peers of equal social rank, or with no one at all. Sleep may be an actively social time depending on the sleep groupings, with no constraints on noise or activity.

People sleep in a variety of locations. Some sleep directly on the ground, others on a skin or blanket, others sleep on platforms or beds. Some sleep with blankets, some with pillows, some with simple head rests, some with no head support. These choices are shaped by a variety of factors such as climate, protection from predators, housing type, technology, and the incidence of pests.

common misperception is that everyone needs eight hours of sleep. The amount of sleep needed is different for each person. This amount needed is individually and biologically determined. Some can do with six hours of sleep, others need nine. However, as a general rule, eight hours is recommended. Sleep experts state that you cannot "store" sleep by sleeping more on the weekends in preparation for the normal work week. Just how much sleep deprivation leads to death in humans is unknown.[2]

Another commonly held view is that the amount of sleep one requires decreases as one ages, but this is not necessarily the case. The ability to sleep, rather than the need for sleep, appears to decrease when people get older. [3]

Failure to sleep results in progressively severe psychological and physical distress. In 1965, California teenager Randy Gardner attempted to resist sleep in an uncontrolled "experiment". As his ordeal progressed he fell into a silent stupor, bringing into doubt whether he was actually awake in any practical sense.

A 1999 University of Chicago team led by Eve Van Cauter limited a group of lean young men to four hours of sleep per night for sixteen days. The subjects showed decreased levels of leptin and increased levels of cortisol. The subjects also increased their daily caloric intake by 1,000 calories. The team discovered that the subjects' insulin and blood sugar levels resembled the impaired glucose tolerance of prediabetics, an indication that they were no longer properly processing carbohydrates. Studies have also linked sleep deprivation to an increased incidence of obesity.

At Harvard Medical School, researchers have identified associations between sleep deprivation and illnesses ranging from hypertension and heart attacks to cancer. Poor sleepers generate increased levels of stress hormones and show more inflammatory changes in the walls of their small blood vessels, both of which contribute to elevated blood pressure. Because of their exposure to light at night, night-shift workers produce less melatonin, a hormone which not only promotes sleep but has been shown to have cancer-prevention benefits as well.

Experiments with rats have measured the effects of long-term sleep deprivation. In one experiment, a pair of rats were placed on a circular rotating platform and separated by a wall. Both were instrumented with electroencephalograms. Whenever the "subject" rat began to show signs of sleep, the platform rotated, forcing both rats to either walk in the direction opposite to the rotation or be forced off the platform into shallow water. The "control" rat was allowed to sleep while the "subject" rat was awakened. After approximately three weeks the "subject" rat became unable to regulate body temperature; even if allowed to sleep at this point, it died shortly afterward from septic shock.

In sleep-deprived states less extreme than that suffered by Randy Gardner, humans display irritability, impaired cognitive function, and poor judgment. Experiments on sleep-deprived medical trainees, for example, have shown them less able to interpret EKGs and x-rays than their well rested peers. As late as the early twenty-first century people thought that too little sleep could be negated by "paying back the sleep debt". However, recent studies have shown this to be false[citation needed].
2006-04-13 9:35 pm
Because we need to live!
2006-04-13 9:34 pm
sothat the musles will relax and rest and its health to sleep
2006-04-13 9:34 pm
To think better
2006-04-13 9:33 pm
I thought I was going to answer your question with a witty, cute answer, but saw how many answers you got already and decided that no matter what I say, it will not be as cute as someone else's answer. Oh my goodness, why do so many people have opinions about your question. Maybe just to get 2 points, mind you, that's why I'm typing right now, I really should go to bed, I can't keep my eyes open at this stage, one of the other answers will tell you why I need the rest.
2006-04-13 9:33 pm
we need to sleep beacause we want be so tired, and irritated. To get energy.
2006-04-13 9:33 pm
Because we need to rejuvenate the body, mind and soul by resting them. You won't want to be a walking zombie.
2006-04-13 9:32 pm
We need sleep so our body's will stay healthy and awake.
You also grow when you sleep. Your body needs rest after a long day. If it didn't have sleep you would always be grumpy and everything would be bad
2006-04-13 9:32 pm
our body has to recover from the pressure we put on it. eating and breathing will replenish you, but not to the extent that actual rest will.
2006-04-13 9:31 pm
if we dont sleep we will feel tired d next day.so its important we get 8hrs of sleep per day.coz after a long day of work,or studyin,or hangin around etc we will naturally get tired.so get sum shut eyes ok.
2006-04-13 9:31 pm
To wake up in the morning.
2006-04-13 9:31 pm
While awake, your brain does an awful lot of thinking, feeling and other functions. It's a chemical process, during which the brain cells give off a "waste" byproduct into the surrounding glial matter, which needs to be taken away by the blood which flows through your body. But after a long day of processing, the waste builds up, producing a feeling of tiredness. It's basically a signal from your brain that it needs to stop functioning for a while to get rid of the build-up. While you're asleep, the excess is carried away...and in the morning you no longer have that tired feeling.
2006-04-13 9:31 pm
good nutrition
2006-04-13 9:31 pm
You need to sleep to get more energy. Without energy it's impossible to live. Enjoy your beauty sleep, although it is fun to stay up late.
2006-04-13 9:31 pm
b/c we need a refreshment it is almost like takin a drink hen ur thirsty. u need replenished. it is just the way we have been intended to be.
have a great day
2006-04-13 9:30 pm
because I love PIZZA
2006-04-13 9:30 pm
Nobody really knows. Scientists only know a little about what happens when we sleep and about why we fall asleep (the biochemical basics, not the reasons for sleeping). Even ancient evolutionary creatures like sharks sleep, so it goes back a long way.
2006-04-13 9:30 pm
Sleep helps the body restore and rejuvenate in many different ways including:

Memory, Learning and Social Processes – Sleep enables the brain to encode new information and store it properly. REM sleep activates the parts of the brain that control learning. The parts of the brain that control emotions, decision-making and social interactions slow down dramatically during sleep, allowing optimal performance when awake.
Nervous System – Some sleep experts suggest that neurons used during the day repair themselves during sleep. When we experience sleep deprivation, neurons become unable to perform effectively and the nervous system is impaired.
Immune System – Similarly, sleep also enables the immune system to function effectively. During deep sleep, the body’s cells increase production while proteins break down at a slower rate. Without proper sleep, the immune system becomes weak and the body becomes more vulnerable to infection and disease.
Growth and Development – Children need much more sleep than adults. Growth hormones are released during sleep, so sleep is vital to proper physical and mental development. The effects (positive and negative) of sleep for babies and children are magnified. Tired children are often cranky, fussy and become easily frustrated and difficult. It is often easier for adults to interpret and remedy the effects of tiredness in children than for them to listen to their body’s own signals for more rest.
2006-04-13 9:30 pm
you can't run on all cylinders with one stoping for a tune up.
2006-04-13 9:30 pm
As a human during today something internal is always going on. You need to sleep for your body to complete functions that it can not do while you are out and about. Sleep is important because one thing that happens during sleep is that food is broken down and its chemicals are used for energy in the cells by the ribosomes and other organelles.Sleep makes it easier for our body to metabolize free radicals—molecules that are said to affect the aging of cells and even cause cancer. In a recent study carried out by the University of Chicago, 11 healthy young men were allowed only four hours of sleep a day for six days. At the end of this period, their body cells were performing like those of 60-year-olds, and their blood insulin level was comparable with that of a diabetes sufferer! Sleep deprivation even affects the production of white blood cells and the hormone cortisol, making a person more prone to infections and circulatory diseases.

Without a doubt, sleep is vital for a healthy body and mind. In the opinion of researcher William Dement, founder of the first sleep study center, at Stanford University, U.S.A., "sleep seems to be the most important indicator of how long you'll live." Deborah Suchecki, researcher at a sleep study center in São Paulo, Brazil, comments: "If people knew what is going on in a sleep-deprived body, they would think twice about concluding that sleep is a waste of time or just for the lazy."—See the box "The Effects of Sleep Deprivation."
參考: I have had science class for 8-10 years.
2006-04-13 9:30 pm
we all need to sleep because we need our rest, enery. Plus we need to grow
2006-04-13 9:30 pm
Sleep makes it easier for our body to metabolize free radicals—molecules that are said to affect the aging of cells and even cause cancer. In a recent study carried out by the University of Chicago, 11 healthy young men were allowed only four hours of sleep a day for six days. At the end of this period, their body cells were performing like those of 60-year-olds, and their blood insulin level was comparable with that of a diabetes sufferer! Sleep deprivation even affects the production of white blood cells and the hormone cortisol, making a person more prone to infections and circulatory diseases.

Without a doubt, sleep is vital for a healthy body and mind. In the opinion of researcher William Dement, founder of the first sleep study center, at Stanford University, U.S.A., "sleep seems to be the most important indicator of how long you'll live." Deborah Suchecki, researcher at a sleep study center in São Paulo, Brazil, comments: "If people knew what is going on in a sleep-deprived body, they would think twice about concluding that sleep is a waste of time or just for the lazy."—See the box "The Effects of Sleep Deprivation."

That's just a little about the necessity for sleep check out the site below.
2006-04-13 9:30 pm
Cause we would all die if we didn't.
2006-04-13 9:30 pm
More energy.
2006-04-13 9:30 pm
Your brain and nervious system need the down time of inactivity to fully feed (recieve blood-carried oxygen and food) and despense waste. During your waking hours the brain still does this but at a much slower and smaller capacity.

When you sleep several things are taking place in your unconcious body, one of which is healing.
2006-04-13 9:30 pm
For our bodys to repair themselves so that we remain healthy. Remember this. Good health means a good life. Good luck and much wisdom.
2006-04-13 9:30 pm
The long post above was from a google search by the way:
2006-04-13 9:30 pm
To rejuvenate your body
2006-04-13 9:30 pm
tom maintain out required energy anf for our body to heel itself after a longs day of work say you get a cut it heels as you sleep and if you didnt it would take 2-4 days to healt b/c it has a lack of energy gained by sleep.
2006-04-13 9:30 pm
you need to relax
2006-04-13 9:30 pm
so that are mind and body can rest and prepare for another day
2006-04-13 9:30 pm
During the day our body uses a lot of energy we then get tired and our body has this liquid that makes us sleep as we grow older it reduces thats why a baby sleeps more than a 10 year old i hope it helped
2006-04-13 9:29 pm
sorry but this is stupid.you need to rest your body and mind.your human not a machine.ok
2006-04-13 9:29 pm
you recharge you!!! you will get very very sick if you do not get enought sleep
2006-04-13 9:29 pm
Try not sleeping for a night or two and see for yourself.
2006-04-13 9:29 pm
I believe it is for your brain to sort out the days filing.

There have been studies that show physical fatigue goes away long before the need for sleep is got rid of.
2006-04-13 9:29 pm
SO YOU CAN FUNCTION THE NEXT DAY . go 2 or 3 ( the least ) without sleep , and then you can answer the question better yourself .
2006-04-13 9:29 pm
You will die if you do not sleep.
2006-04-13 9:28 pm
if you dont you will be tired
2006-04-13 9:28 pm
so u don't act like a b****!!!
2006-04-13 9:28 pm
Sleep assists the body in regeneration. Without sleep, even walking would seem difficult.
2006-04-13 9:28 pm
You must be retarded if you ask that Question!!!!
2006-04-13 9:28 pm
Sleep gives your body a rest and allows it to prepare for the next day. It's like giving your body a mini-vacation. Sleep also gives your brain a chance to sort things out. Scientists aren't exactly sure what kinds of organizing your brain does while you sleep, but they think that sleep may be the time when the brain sorts and stores information, replaces chemicals, and solves problems.

The amount of sleep a person needs depends a lot on his or her age. Babies sleep a lot - about 14 to 15 hours a day! But many older people only need about 7 or 8 hours of sleep each night. Most kids between the ages of 5 and 12 years old are somewhere in between, needing 10 to 11 hours of sleep. Some kids might need more and some need less. It depends on the kid.

Skipping one night's sleep makes a person cranky and clumsy. After missing two nights of sleep, a person will have problems thinking and doing things; his or her brain and body can't do their normal tasks nearly as well. After five nights without sleep, a person will hallucinate (this means seeing things that aren't actually there). Eventually, it becomes impossible for the brain to give its directions to the rest of the body without sleep - the brain needs to spend time in bed and catch its ZZZs!
2006-04-13 9:28 pm
nobody really knows. just theories.
2006-04-13 9:27 pm
To get more energy but it feels like you don't get any energy!
2006-04-13 9:27 pm
hey Smartchick

what the hell is R&R??
2006-04-13 9:27 pm
So you don't die while driving a car because u were dumb enough not to sleep, therefore, you let go of the wheel , fall asleep, and crash into another car

;-)
參考: My Brain
2006-04-13 9:27 pm
To Recuperate after getting drunk
2006-04-13 9:27 pm
yeah
2006-04-13 9:27 pm
so your body can recharge it needs sleep like it needs food and water it fuels the body
2006-04-13 9:27 pm
To get rest and go another day.
2006-04-13 9:26 pm
for R&R
2006-04-13 9:25 pm
why dont you find out yourself

收錄日期: 2021-04-25 13:04:05
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https://hk.answers.yahoo.com/question/index?qid=1006041313177

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