This method of getting off to sleep is on the Dilbert Blog. Wonder if it works? I will give it a try as I would love to be able to fall asleep in the dentist's chair!
" …I always start by creating a simple story in my head where something good, and highly unlikely, happens to me. The trick is to focus on something that is more fascinating than your real life. Maybe you are winning a prestigious award, inventing something that changes the world, or being the first person on the scene of an accident involving the Cirque de Soleil and a tanker of chemicals that turn out to be a powerful aphrodisiac. The images should be more attractive than whatever bothersome thoughts would float into your head if you weren’t so busy fantasizing.
After a minute or two of that, I release all controlled thoughts and simply watch what floats by. ..
Toaster…car…pencil…couch…snow blower, mitten, etc.
The next thing I know, I wake up."
There are some quite interesting comments on it too, fun to read if you have a spare 10 minutes.