I actually wrote a blog about ways to get a good night sleep over at my MySpace about two years ago.
But how I actually fall asleep is usually similar to what has been mentioned so far. I think of "stories", whether I'm reliving something I enjoyed sometime in the past, imagining something that I
wish would happen and day dreaming about how great it would be, or just entertain myself with random characters or people I know. I also usually fall asleep before I finish it, but I'll think it up again the next night, and maybe add improvements to it. As to actually falling asleep, I just find a comfortable position, make sure my neck and shoulders are well supported and just relax. It helps to be a little too warm, too. Not to where I'm uncomfortable, just a little warmer than normal. I sleep best with lots of covers over me.