[krtkush]

Blue light produced by screens is harmful and effects sleep pattern.

[skocznymroczny]

Do you have any sources for that? Not being negative here, but last time I checked it was mostly in the realm of hypothesis and broscience.

[a-saleh]

This sounds like a source. http://www.gwern.net/docs/melatonin/2009-burkhart.pdf

But it seems to be very subjective. And the group that started limiting blue-light before sleep seems to have percieved their sleep quality as quite low, so the improvement might be only correlated?

[timrichard]

Both iOS and Android have timed night mode features to lower the colour temperature... or at least apps to do that if not using a recent OS.

I'm not convinced it's much of an issue these days.