Well, for me when I can't sleep I set myself a time and say "if I'm not alseep by then, I'll do an all nighter" - that usually works some of the time But normally I just have all nighters, it's the holidays so it's alright even though it's not healthy Try warm milk, reading a book or watching a documentary or something x)
I just lay there and think. I actually sometimes give games with no story or a fairly week story (cooking mama for example) a really intricate story and continue with it for nights until the game is over.
It sounds creepy, but I'll lull myself to sleep by listening to myself breathe. XD If that doesn't work, I'll close my eyes and create a story, and then let it run its course until I'm asleep.
I only fall asleep to only 2 certain songs: Yourbiggestfan - NeverShoutNever. & Trouble - NeverShoutNever. Him playing his Ukulele makes me sleepy. He plays really smoothly. imo.