Insomnia...

[spmetla]

I'd recommend getting some exercise. Try and go for an 20-30 minute evening run and then knock out a bunch of pushups and situps or other exercises. Have a light but good meal, then read a book or paper or something. I find whenever I have had problems sleeping its either because I haven't done anything physical all day or there is something problematic coming up that I haven't taken care of yet (things due in school, work issues and so on). If you already exercise regularly try and work something that you don't normally work so that the body needs the rest to the build/rebuild those muscles (if you lift then go running, if you run go lift weights), just try and get yourself physically tired and somewhat sore.

Also if you have curtains or something close them up so that you do not awake from the sunlight pouring in.

Other less safe/healthy methods are to either try and stay up one night so that your body can sleep well the next day or to go to a bar and get totally wasted with some buddies.

Hope you get some more sleep!

EDIT:
There are A LOT of insomniacs here at the Org!