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Guzey updated changed his mind on this topic: https://guzey.com/2022-lessons/#get-minimum-possible-sustain...

It's unfortunate that he hasn't added a disclaimer to the original post since it is shared so widely.

EDIT: fixing autocorrect

Wow it’s crazy how he didn’t add a disclaimer to his original post.

EDIT: Did he really change his mind? Still seems like he thinks that book is pseudoscience, just that sleep is more important than he originally gave it credit for.

I think he changed this perspective on sleep as a whole, but the factual errors in Matt Walker’s book remains there.

In fairness, you should probably also link Walker's response to Guzey and others.

Some of the criticism he rebuts and some he accepts and says he will deal with it in a future version of the book.

Would happily have done so, but didn't know that it existed. Is this what you're thinking of?

https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-...

obligatory counter https://www.lesswrong.com/posts/sbcmACvB6DqYXYidL/counter-th...