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A comment on Brains Sweep Themselves Clean of Toxins During Sleep (2013). Parent comment

Re:Brains Sweep Themselves Clean of Toxins During Sleep (2013) by tbirrell on Monday April 17, 2017 @02:34PM (#14133266)
Hmm... Interesting, almost like a heart. Expand, contract, expand, contract. That could be why we have multiple dreams a night.
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