I stay up half the night cuz I can't sleep what can I do?!

If you sleep with the TV on try with out it. I heard somewhere you should not try to fall asleep until your truly tired. (dont quote me on that) There is also meditation which will help clear your mind and relax your spirit before bed. If its a sleep cycle problem, or you would like your sleep cycle back I recommend Melatonin. Melatonin is a natural chemical produced by the Pineal Gland help induce sleep among other things.

Facebook, Myspace, Xbox, Skpye, Call buddy if any of them are awake and hang out (yes in the night or at home) or a Conversation, Reading (idk if you like reading as a option)
Hopes this helps.

There are drugs like Lunesta that you can take. Personally, I drink a glass of warm milk if I can't sleep. Relaxes me and puts me to sleep within the hour :D