The twenty first century made a lot of humans “attached” to smartphones - those technological wonders that manage to make almost every person look down at them over and over again: at work, in bed, in the subway, in airplanes, cafes, everywhere. Besides all the good they bring to the world, smartphones also have the ugly power of tiring our eyes and keeping us from sleeping well. This happens mostly because we tend to use our smartphones and look at their screens right until we Fall Asleep. That’s not good because the blue light their screens emit affects our circadian rhythm which impairs our ability to fall asleep. Unless you plan on not using your Android smartphone or tablet for a few hours before you go to bed, a solution to reduce the negative effects of the blue light emitted by it, is to install and use an app that filters it. We tried some of the most popular apps from this niche, and we’ve ended up with a few which we consider the best: