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Re:Get better sleep – Anecdata and sleep tech by najra on Tuesday February 22, 2022 @05:05AM (#30426019)
Just a heads up there's been some controversy around some of the claims he makes in the book: https://guzey.com/books/why-we-sleep/
Re:Get better sleep – Anecdata and sleep tech by criddell on Tuesday February 22, 2022 @09:02AM (#30427994)
Walker has addressed some of that here: https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-...

On Peter Attia's podcast, he address a bunch of the criticism as well. The second edition of the book has been updated to correct errors.