I hope I'm not out of line by asking......when you're trying to sleep is your mind racing about things that either just happened or are going to happen? I find when I have too much on my mind or one thing that's worrying me, I can't sleep. I have always believed that you will sleep better if your mind is clear. In effect, you are unable to relax if this is the case, so you're not going to be able to sleep. Extreme stress in one's life might possibly cause the body to react differently so sleep comes easier. Believe me, I've been there and done that. I still do it as a matter of fact. The only thing I try to do is to try to keep my mind clear and/or think of something real pleasant. Have you tried those relaxation tapes, discs, etc.? How about some aromatherapy like lavender? Good luck. I hope you get some sleep soon because sleep deprivation is awful
The mere thought of school re-starting could be the culprit.