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blue light
All that seems to be challenged recently: https://time.com/5752454/blue-light-sleep/
The main reason for avoiding screens before bed is they provide too much (mental) stimulation. Doomscrolling TwitterOmicronCovidFuckwittery is not good for relaxation (unlike reading, even on a device like a Kindle).
Also using something like f.lux to reduce blue light on the screen when sun goes down (lot of phones have it built in too now)