Buy a lot of Serta counting sheep (about 50). Then bring them with you to bed and when you want to get to sleep pay someone to stand outside your window and throw them into your room. Count them as they fly in. If it takes you really long, then pay someone to also stand inside your room so they can throw them back and forth while you count. And then think of that song on the Serta sheep commercial. You know:

Gonna put you to sleep, gonna put you to sleep,
We're the sheep with the sleep and there's no more peep!
Gonna put you to sleep,
We're the sheep with the sleep and there's no more peep!

Just keep thinking of that song and count the sheep being passed back and forth. Eventually this'll be too much for you mind and you'll fall asleep right away (with some guy in your room and another right outside your window, but no worries, they'll go away. Right?).