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.

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