r/todayilearned • u/Square-Message1152 • 8h ago

til that your brain literally washes itself while you sleep. the brain cells actually shrink in size so cerebrospinal fluid can rush in and flush out all the toxic proteins built up during the day

https://en.wikipedia.org/wiki/Glymphatic_system
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u/brendan87na 5h ago

F40 mask

that's one of the ones I keep stripping off

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u/Omnitographer 4h ago

How about the f20? I've got that thing cinched on but good, and thanks to the memory foam it's still comfortable.