Why do I wake up in the middle of the night for no reason and how do I combat this?

The last two weeks or so I have been waking up in the middle of the night for no apparent reason. I don't need to pee once I wake up, I am not dehydrated or something like that, I don't have any new worries in my life. I just wake up within 4 hours of falling asleep every time and for some reason the back of my head and my neck are always really sweaty when it happens (even though it isn't hot). What could the reason for me waking up be and how can I combat it?