Insomnia cures..?

There is no cure for things. Let's get that straight. Zoloft is not curing your anxiety or depression, etc; it is AIDING your handling of it/them.

You can call your doctor right now and tell them about the insomnia. They will know the best way to handle it.

Here you won't get a medical opinion; just"warm milk" remedies that don't work.

There are other anti-depressants that are better for sleep, like Wellbutrin.

Until then, when you have insomnia issues: don't exercise in the couple hours before bed, do exercise in the morning, don't eat a large meal in the couple hours before bed, don't drink within a couple hours of bedtime, don't nap, try to go to bed and get up at about the same time even if going to bed on time means lying in bed awake (generally, even if you think you're wide awake you're actually closer to sleep than you think, and are drifting in and out of light sleep), and make sure it's dark and quiet (you could wear ear plugs) and not too hot in your room. Melatonin may also help, as a short term solution.

There are a few things I find helpful when I get bouts of insomnia. First ones being asmr and binaural sleep beats on youtube. They both relax greatly, but if asmr seems a bit too weird for you, put on some sleep binaural beats (they use sound frequencies to help you sleep and it works wonders!) or guided sleep meditations on youtube. If this fails you can try the herb valerian - BUT talk to your pharmacist to see if you can take it whilst taking zoloft. Personally valerian is what I take when all else fails - it is a natural sedative, but I find you need to take 6 valerian pills instead of the 1-3 they recommend on the bottle. Best of luck - I hope you find some rest !