Luna

Luna enables you to lower the brightness of your phone or tablet more than what you can do by default in order to avoid a headache and eye pain in a dark environment or at night. If you own an Amoled screen, this app will even save your battery because black pixels actually turn off on an Amoled screen. It is also scientifically proven that blue radiations can cause insomnia, preserve your sleep by changing the filter's color to red or brown!