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I'm pretty sure the numbers aren't plausible. I feel at my best if I sleep about 8-9 hours. Maybe I can cut half an hour and still do well but sleeping only 6 hours every day guarantees I'll feel like shit all the time and I'd be surprised if it shortens my lifespan by anything less than 30%

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Additional anecdote here, if I sleep 8 hours or more I feel horrible, the same as if I slept 12 (oversleeping) but I feel better than ever when I get 5-7.5 hours a night. I don't think there's a one size fits all, sort of like calorie counting

Are you able to "oversleep" even when you are not sick? I suspect that the few times that I've been able to sleep more than 9 hours have all been because of illness and/or bad quality sleep. I can easily stay in bed for 12 hours, but staying asleep is another matter.

Yup, though one might argue that I'm always sick, because I have mild allergies to just about everything airborne. Otherwise on a completely normal day, if I sleep for 8 hours I'll feel as if I overslept, especially if it's more than one night in a row

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