This is why I listen to audiobooks when trying to fall asleep. If I can't fall asleep, I'd rather someone read me a bedtime story than have my own thoughts bouncing around the inside of my head all night.
His voice is so calming and re-assuring and the background music also helps.
The O'Neill cylinders series never failed to make me sleep -- I could imagine myself living in such a neat space, floating in the middle of such a cylinder, producing large amounts of food, the world's problems far away, and boom, I'm asleep.
I think I used to fall asleep like this when I was kid imagining I was travelling in captain Nemo's submarine.