There’s solid clinical evidence at the meta review level for blue light filtering glasses for insomnia and for sleep hygiene interventions which often involve limiting bright screen exposure. Televisions, smart phones, and ubiquitous indoor electric lighting (especially “daylight” bulbs which are very intense and blue) are major offenders. Day time bright light/sunlight and night time restriction of light exposure (with some bias for blue light) is very important. There’s plenty of evidence light intensity and wavelength has dramatic effects on sleep cycle regulation. I feel like you’re throwing out the baby with the bath water. This red screen stuff has received a lot of media attention but the evidence base (which I can't look up right now because I'm currently winding down to sleep and need to avoid interesting things) is not as impressive as suggested by the media reports. A dimmed and reddened screen via things like f.lux can be a little bit helpful on top of having boring/predictable content, but if the content is stimulating then the dim red screen isn't going to help you relax and fall asleep. You don't want rewarding, exciting, or upsetting content while you're winding down to sleep - boring and/or predictable is best. For example, an interesting book can keep you awake longer than a boring YouTube video. To answer your first question, it's the content on the screen that's far more important than the brightness and colour. Sleep when your body wants to sleep, but talk to your doctor if the timing of when your body wants to sleep causes problems in your life. Personally I say: the early bird catches the worm, the late bird gets pancakes. There is a lot of weird cultural moralising about the "correct" time to sleep which, as a health professional who works shift work, gets really annoying. Chronotype (check out the Wikipedia article) varies across age for each individual as well as between individuals. To answer your second question first, there is no "correct" time for humans to sleep. See also the full list of Psych/Cog/Neuro subreddits. Some other subreddits you might be interested in: No bullying, brigading, doxxing, illegal content, etc. If your post is not related to the brain, this is not the community for your post. If you're posting a link to a news article coverage of a paper, you must submit a comment with a direct link to the paper if the article you post doesn't have one. This rule doesn't apply to questions or speculative discussion that is properly caveated or very basic neuroscience facts. Posts that assert a positive claim about the brain must include peer-reviewed or pre-print support for that claim. /r/Medical ( Questions about medical practices & procedures)./r/AskDocs ( General Health Issues & Questions).If you are in need of medical advice, go see a doctor or visit other subreddits that allow medical questions: but any post containing personal or health information may be removed at moderator discretion. This especially includes medical advice, clarification, diagnosis, and discussion of symptoms, drugs/supplements, medical procedures, etc. For more academic discussions of journal articles, /r/neuroscience is a great place. We're a bit laid back here, you're free to post anything about neuroscience as long as it doesn't break the rules. r/neuro, involving neuroscience: Discussion and news pertaining to neurobiology, cognitive studies, clinical neuroscience, the laboratory, and anything else related.
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