Like many of you, I spend a lot of hours in front of the computer. Especially during the night, you might have noticed that the screen is really bright and you have problems looking at it. I had the same problem until I discovered f.lux. I’ve been using in the last 9-10 months and I really feel an improvement: is much easier to look at the screen during the night.
f.lux is a free, lightweight application that adjust the temperature of the colors on the display in order to match the natural lighting conditions. While the sun is up on the sky, the screen displays normal colors. During sunset, a slowly transition to night colors. After this, the colors are colder and, for example, white becomes brownish. It might sound strange but it really helps.
f.lux can be download it from here and it is available for Windows, Mac and Linux. On the same page, is a research on sleep and more details about how f.lux helps.