Stretching or foam rolling before bed seems to help. However, the best thing I've done was to black out the window with construction paper, then cover all of the little lights in the room. In a dorm room with two students (therefore, two computers, two alarm clocks, etc.) it made such a huge difference. Previously, I was waking up at least once during the middle of the nght most nights of the week for over two months. Slept like a baby since I blacked out the light. It can be the middle of the day and I can take a nap in complete darkness. Kicks ass.
I know that Garrett also recommends no electric things plugged in within six feet of your head, but I don't have space in here for that right now. If I could, I would, since I'm sure it couldn't hurt.