If you end up staring at a computer screen late into the night like I do, the light may be disrupting your circadian rhythms. Theres a utility called Flux (http

If you end up staring at a computer screen late into the night like I do, the light may be disrupting your circadian rhythms. Theres a utility called Flux (http://www.stereopsis.com/flux/ http://www.stereopsis.com/flux/) which adjusts the brightness and color of your screen depending on the time of day to make it less disruptive. I've found it to be helpful in getting me feeling sleepy earlier.