I hope you're not jesting, as this was my first thought. I definitely found it easier to fall asleep and stay asleep after installing Lux on my tablet, and phone. Flux for my computer.

If I disabled Flux -- like I just did -- it's awfully painful! Torture! How did I used to stare at this awfully lit thing for hours on end and expect sleep to be peaceful?!

On a serious note, it'd be interesting to see whether it's the actual 'light exposure' that's hindering the sleeping process, or the 'blue light' that Flux, Lux and others have set out to solve.

Another option is to get orange-tinted glasses.[1] That will block blue light no matter where it comes from.

1. http://www.amazon.com/Uvex-S0360X-Ultra-spec-SCT-Orange-Anti...

Not sure if that is actually a solution? No studies have been done yet (I think) which investigate if there's a 'safe' threshold for amount of light the screen exposes a person to, under which the effects on sleep etc are absent or extremely small. So for all we know it might be better with f.lux, or the same, can only guess.

For Android, try Lux Auto Brightness. I have been using it for years both on my phone and tablets.

* https://play.google.com/store/apps/details?id=com.vito.lux&h...