iOS 9.3 Preview – Apple. Blue light keeps you awake, everyone is in bed reading iOS devices, 9.3 will make your screen less blue based on where and when you’re at.

Many studies have shown that exposure to bright blue light in the evening can affect your circadian rhythms and make it harder to fall asleep. Night Shift uses your iOS device’s clock and geolocation to determine when it’s sunset in your location. Then it automatically shifts the colors in your display to the warmer end of the spectrum, making it easier on your eyes. In the morning, it returns the display to its regular settings. Pleasant dreams.

Read more.

Apple is calling this “Night Shift” and it sounds like they’re adding a f.lux – like feature to iOS. f.lux has a ton of researched linked here. Apple previously removed attempts to “sideload” f.lux.

See – “PNAS study: using iPad before bed has major impact on sleep“.