I did cognitive behavioral therapy for insomnia years ago, and at the time had the same issue with waking up and then laying in bed for hours trying to get back to sleep. It led to a horrible cycle of anxiety about whether I’d be able to sleep, which of course made it harder to sleep. The most important rules are to try to go to bed and get up at the same time every day. If you’re awake in the middle of the night and can’t fall back asleep after ten minutes, get out of bed and do something quiet with no screens. I recommend hand washing dishes, dusting, or folding laundry. This is productive, calm and quiet, and boring enough that you will be happy to go back to bed when your body says you’re ready. When you start doing this, you’re going to be even more tired during the day. Just suffer through it, don’t take a nap and don’t try to counteract it with caffeine or other stimulants! That will only exacerbate the cycle of insomnia. I also recommend keeping a journal of when you go to bed, every time you wake up, and when you’re finally up for the day. You might find that you naturally wake up less if you give yourself a different bed time window.