I just wanted to let you guys know about a neat program called F.lux. It's really helpful for late night PC users. F.lux makes the color of your computer's display adapt to the time of day, making the color scheme warmer (more red) at night. By doing this, F.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again. The purpose of the color change is to remind your brain that the sun has set. Most people keep their monitors at a high brightness where white looks more cool (bluer). The problem with this is that it tricks the brain into thinking that it's also bright outside as well, so you tend to stay up later.
I've been using this program for a while now and so far, I am enjoying it. While there is a small performance lag once F.lux starts to kick in, it disappears once the color scheme has been set. Also, F.lux does not work for most full-screen games, but it should work just fine for windowed games. Personally, I feel like I am less restless at night and have less difficulty falling asleep as well.
Anyways, get it at their website: http://stereopsis.com/flux/