A big help for me has been trying to fall in line with the natural circadian rhythm of sleep. Try to get to bed early, and make sure your room is as dark as possible. Turn off your computer and/or TV some time before bed (I hear recommendations of 30 minutes, I just try to go for ~15). Try to wake up with light, whether that's with a sunrise alarm clock that emulates the dawn, or the natural sunrise.
I really enjoyed this article on sleep optimization that was posted on HN recently: http://brianmartinek.com/2013/08/22/three-simple-ways-that-i...
Finally, working out is a tremendous help. Especially if you can try to do a workout that maximizes the release of hormones like endorphins and testosterone.