Can we have a sunset filter effect in Unity, KDE, and Compiz

[John Moser]

I'd like to see a configuration option to uniformly reduce the blue channel
in the desktop during certain hours.  It's ugly, but people have had good
results on other OSes with fading the screen to red-orange as it nears
their bedtime, using applications such as F.lux.  This prevents the brain
from staying awake and excited, or so goes the hypothesis.

Thoughts?
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