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This topic is basically damned with anecdotal oblivion.
According to Dr. Amen, screens and other lights at night make your brain think the sun is still out (this is my dumbass way of phrasing it).
Personally, reading on screens with the functional equivalent of a flashlight behind the screen is aggravating and wreaks simple havoc on my astigmatism, so I avoid it all the time.
I want to add to the anecdotal hearsay as well: when I have lots of lights on and screens on at night I really don't get all that tired unless I am already exhausted. If I turn off everything and just sit in the dark I get tired as Hades.
I have no idea if what I just said is even true or whether I believe it. I don't keep detailed records and have no real ideas.
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