Please note: I am resharing this post here so that more users can discover this, the original thread was in Nexus 5x written by me. Hey all, So I'd like t…

Are you having trouble falling asleep? Are your kids hyperactive when playing with the tablet before bed time?
Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!

WARNING: Android O+ does no allow the app to cover your notifications any more..

CAUTION: Android TV installation got more complicated as Google did not implement the overlay permission screen, please see below:
https://twilight.urbandroid.org/how-to-install-twilight-on-android-tv-android-6/

Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.

The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range which may suppress Melatonin production - a hormone responsible for your healthy sleep-wake cycles.

In experimental scientific studies it has been shown an average person reading on a tablet or smart phone for a couple of hours…