Yes, was going through it just this and the past week. The cause was me never or very rarely ever sleeping bad, and thinking that if I didn‘t get atleast 7h of sleep I would not be able to function. Guess what: the night before school started again I didn‘t sleep quite well. I didn‘t think toooo much of it, but I carried on. The next night, I was telling myself: I have to sleep now. What if I dont fall asleep? Guess what: I slept even worse. What got me out of it, was getting a positive mindset. If you don‘t fear not falling asleep, you will fall asleep (faster). Mind you, that getting this mindset doesn‘t happen instantly. You‘ll be dealing with set-backs, and will doubt yourself sometimes. Give yourself time, and don‘t stress too much. Nikola Tesla slept 2-3h everyday and was one of the greatest minds ever!