In spite of all the wonderful things computers have added to modern life, they’ve given us some pretty rotten things too: sentient AI along the lines of HAL and SkyNet, diminished capacity for social interaction, FarmVille. But of all these modern inconveniences, repetitive strain injuries have to be the most prevalent, persistent, and downright annoying. From headaches to hand cramps, there are myriad ailments you can blame on your PC.

Including sleeping poorly.

Ever since computers stopped using interfaces made up of neon green fixed-width type on an empty black screen, the light emitted by your PC’s display was meant to mimic daylight. Specifically, the color temperature of most displays is set to around 6000K by default.  And if you leave your display’s brightness setting at the higher end of its range, it means your eyes are getting bombarded with an awful lot of photons.  Didn’t your mother ever tell you not to stare into the sun?

And burning holes into your retinas aside, staring long and hard at your computer screen after dark can actually affect your circadian rhythms—the biological clockwork that tells you when it’s time to eat, time to wake up, and time to sleep.  Since your body interprets the cooler temperature light coming from your display as sunlight, it thinks computer time equals party time, even if it’s actually nighttime and you want to retire shortly after that last round of Spider Solitaire.

So what’s a self-respecting technophile to do? Luckily, the kind folks who designed F.lux made it just for you.

F.lux is a simple, free application (for Mac, Windows, and Linux) designed to run in the background on your computer and create a gradually changing color overlay for your display to affect the temperature of the light it emits. It’s tailored to your geographic location and the kind of indoor lighting you already have to make its changes in time with the sun’s movements and to create overlays that look like the artificial lighting you already have. You can make the transitions a quick 20-second flip, or an hour-long fade. There’s even an option to disable the whole program for an hour at a time when you need to do color-sensitive work like photo editing or graphic design.

While F.lux doesn’t affect your display’s brightness settings, the less intense contrast from the overlays helps reduce eye strain in addition to helping your body clock remember what time it is.  It’s a sneaky utility.  You will barely notice it’s there, but take stock a week or so after installing it.  If you’re anything like me, you’ll notice you haven’t had nearly as many headaches as usual and your eyes don’t feel like they’re made of sand after hours in front of the computer.

And hey, maybe you’ll even sleep better!

Thanks to IRPC on Flickr for the image!