[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?