My former housemate also just reminded me of this computer program that I'm going to try to see if it helps since I'm usually on my laptop until right before bed. It's f.lux and it changes the colors/hues of your computer screen so that it's less of that blue light especially at night hours. My screen is now a weird yellowy/orange color. It's something else to consider if you're on your computer until the last minute.
You can get a similar thing for your phone/tablet (its called Twilight if you have Android, I know there's an iPhone one but I can't remember the name).
It's three days into school and I'm having a progressively awful time falling asleep and staying asleep at night. I don't know why, because I'm not even stressed.
Last night it took me until midnight tossing and turning and I woke up several times, and had awful nightmares. It's hard to pay attention in class like this.
I hope it stops.
My bf was really having trouble lately and between the stuff below he was able to get his sleep schedule back on track. The same stuff has worked for me in the past.
General:
1. Have a regular sleep and wake time
2. Create a calming bedtime routine (I read for about an hour)
3. Put away electronics an hour before you plan to fall asleep
4. Make sure your room is dark and cool
5. Cut down on caffeine, especially in the 8 hours before bed
6. Increase exercise, but make sure your exercise is more than 2 hours before you plan to go to bed
If you can't fall asleep:
1. Count backwards by 3's from 600
2. Listen to nature sounds or instrumental music
3. Try progressive muscle relaxation
4. Get up, go to a different room, and read a boring book until you get tired. Then try again.
5. If there is something on your mind that just won't stop bugging you write it down to get it out of your head. If it's a problem of some kind, write down a possible solution too. I tend to write to-do lists before bed so I'm not worried about all the stuff I need to do the next day.
Making sure you stay asleep is more difficult, but melatonin supplements helped my bf.