f.lux, a popular screen-lighting tweak for computers, has just released a version for iOS. f.lux for iPhone and iPad will "warm up" your screen to match the ambient lighting at night, gracefully reducing your device's bright, blueish-whiteish glow.

All you'll need to do is select the type of lighting in the room you're in at night, and then forget about it, f.lux will do the rest. Research has shown that reducing the brightness of your screen's glow can help reduce eyestrain and better prepare you to fall asleep.

f.lux for iOS is available now for free in Cydia.There are no new icons added to your SpringBoard with this tweak, and f.lux settings can be configured right in your main Settings.app.

For more information on f.lux for iOS, head on over to the official release page here.