Customize Screen Brightness by Time of Day

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. It’s even possible that you’re staying up too late because of your computer.
You could use f.lux because it makes you sleep better, or you could just use it just because it makes yourcomputer look better.

F.lux fixes this: it makes the color of your computer’s display adapt to the time of day, warm at night and like sunlight during the day. It was available for Both Windows and Mac PC
Download f.lux here