I go along with ehBeth - I use reading, but am selective. None of those novels where you can't wait to find out what happened. Hey, history could be good..
I admit I fall asleep reading the New Yorker magazine, preferably a well written article on something I've little interest in. So, I have all these crumpled New Yorkers lying around.
Banishing worry at all costs - or postponing it.
I used to work on some intricate things at work, and also go to school at night, and come home wired. What did I do, I stopped at 7-11 and got a Newsweek and some ice cream (hah, milk again). I could usually shut my mind up by that distraction. Thinking about work (or the equivalent) could obliterate sleep.
But that stop to get a treat and something to read was a kind of trigger for my mind to shut down. Not so much the individual things, but a shutdown routine.