F.lux is an extremely powerful, free software (for Windows, Mac, and Linux) that does exactly two things: red-shifts the screen colors of your computer based on where you are in the day. This means that if you are sitting in the shade in the middle of the afternoon, the colors on your screen will shift to green at night, since the green light is less bright at that time. If you're using an application like Firefox, Safari, or any other web browser, or even just a web-based email program, F.lux can also "red-shift" the colors of your PC's desktop background when you switch windows.
I use F.lux every day, it's just a matter of finding the right version for me. My current setup involves a WiFi access point, which also enables internet access for my laptop. Because I work from home most days, I'm not usually out of site for long periods of time, meaning that even if I'm not using a WiFi network, F.lux should still be able to "red-shift" my computer screens in whatever region I'm in. And because I use Firefox, Safari, and Thunderbird, even if I'm abroad, F.lux should still be able to "red-shift" the computer screens in the regions where I'm accessing those programs, since there's a Firefox icon in my system tray which reminds me to turn it off periodically (I'm also using Linux, so F.lux may not work with that).
Another benefit to F.lux is the way it makes my computer look like it's almost awake, because if it were real it could adjust its own clock based on my time zone... but since it's a program, it has no internal clocks. F.lux does nothing by itself to make my computer look like it's working better, but it does what it can and I don't have to be actively "on" my computer to get the results I'm looking for. There's no need to worry about making F.lux "look" better or worse than some other program on the market, because that just won't happen. It works exactly as it is supposed to, which means that any computer user could use F.lux to help them sleep better at night.
