Don't have a TV* or laptop in your bedroom, don't read in bed, don't work in your bedroom. Treat your bedroom purely as a room in which you sleep, nothing else. Well maybe sex from time to time, but otherwise, just sleep. Helps you avoid forming bad habits sleepingwise. And I avoid drinking more than two or three caffeinated drinks in a day, and none after about 6pm. Used to sleep badly until I did these things.
*television, not transvestite (they do seem to be something of a theme on WDWV, so feel free to have one of them in your room if that's your thing)
