When I can't fall asleep, I play games on my cell phone hehe. I used to always play sudoku and it took me a few games to knock me out, but I got really bored of it haha. Then I played a word game called Word Twist, basically just making words from a bunch of random letters. And now, pretty much every night, I play Bingo LOL. It knocks me out pretty fast actually...just 2 games and my eyes feel really heavy and droopy.
Oh, and a couple weeks ago, I tried the "counting sheep" method, and it actually worked for me LOL. I counted up to around 30 something xD