Blue light does not disrupt sleep.
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They've debunked the blue light thing recently. It's not disruptive to sleep.
https://time.com/5752454/blue-light-sleep/
https://www.sciencedaily.com/releases/2019/12/191216173654.htm
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It doesn't really matter to me as long as my mattress is comfortable, I sleep just fine.
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Totally agree with you. Probably it depends on the quality of the sleep first of all. I'm bipolar so sometimes it's very hard to sleep. I solved this by buying a couch and a high-quality mattress. It's easy to find them. I recommend to you Amazon or sites like this