How to use your Android in the dark without hurting your eyes

Problem
Using your Android phone in the dark can strain your eyes! Don’t
worry, you don’t have to give up using your mobile at night. You could
just turn down the brightness on your phone but there are two reasons
for not doing this. The first is that you have to go to the effort of
turning down and then turning up the brightness, I know, poor you. The
second reason is that turning down