Daily briefing: Meet Punk and Emo, the 430-million-year old mollusc fossils
Briefly

"Blood vessel contractions co-ordinated by regular spikes of an adrenaline-adjacent hormone help to 'wash' the brains of mice while they sleep, flushing cerebrospinal fluid and clearing out unwanted chemicals."
"During sleep, the brain's waste disposal system – the glymphatic system – plays a crucial role in clearing out any unwanted chemicals, demonstrating the evolutionary importance of Sleep for cognitive health."
Read at Nature
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