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morganism comments on Open thread, Jul. 18 - Jul. 24, 2016 - Less Wrong
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Lots of sleep science out this week, but this one purports that you need 6-8 hours sleep to flush the beta-amyloids out of the brain. They say that "Caverns" open in the brain during sleep, and cerobospinal flows in forcefully to flush out toxins.
Also don't use your smartfone as an alarm clock
http://qz.com/424120/our-poor-sleeping-habits-could-be-filling-our-brains-with-neurotoxins
It's worth mentioning that this doesn't mean that flushing out beta-amygloids is the only thing that sleep does. I think various processes happen during sleep.