so because blue light on screens affects sleep

http://www.youbeauty.com/health/colu...onin-and-sleep

http://www.fitsugar.com/Better-Sleep...-Light-2037593


I decided to adjust the screen on my pc and android phone by adding a red filter on it at night https://play.google.com/store/apps/d...91cnNjcmVlbiJd

and it did improve my sleep (not that I have bad imsomnia and sleep really late, but it is definitely more pleasing to the eye during the night). I was wondering if there was a way to do something like that on the n900?