If you use a Windows PC at home, whether desktop or laptop, you probably use it throughout the daytime and into the evening. While the screen brightness you configure for use during the daytime is probably just fine, there's also a good chance that it's too bright for the evening, when ambient lighting (ie, around you) is much dimmer and of a different "colour temperature". That is to say, it's probably more yellowy and less bluey. Which means that, when you do finally go to bed, the additional blue light you've been seeing during the evening could keep you awake and prevent you from sleeping as soundly as you might otherwise have done so.
To the rescue of all night-owls comes a program called Sunset Screen. At pre-determined times (sunset generally, though you can change it), it automatically dims your screen and changes the colour temperature too. The author claims that the program is preferable to the better-known f.lux utility because the timings are more flexible and because there's a greater range of colours available.
Sunset Screen is free, and the download is less than 1M. You'll find it at http://www.skytopia.com/software/sunsetscreen/ and it's also available as a portable version if you prefer. The program is malware-free according to VirusTotal and Web of Trust.
If you haven't tried F.lux, and you'd like to experiment with that program too, you'll find details at http://www.techsupportalert.com/content/reminder-if-you-use-windows-just...
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