There have been a lot of studies about smartphone lights affecting your night’s sleep. The emitted light from the smartphone can negatively impact sleep by altering the body’s circadian rhythm. With Night Shift mode enabled on your iOS device, when the sun goes down, the iPhone’s screen will automatically change towards the warmer (yellower) colors in the spectrum, reducing blue light. In the morning, the display automatically turns to its normal temperature color, mimicking natural daylight. The idea is similar to f.lux, a popular Mac and Windows app that changes the lighting on your display based on the time of the day
Night Shift feature appears to be limited to iOS devices that have a 64-bit processor. That includes the iPhone 5s and later, the iPad Air and later, and the iPad mini 2 and later.
[ Via : Designtaxi ]