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The points you listed feel like strong arguments to discredit a book - what makes you feel they're nitpicky? i.e.

#1 is the author using a linear model where it doesn't apply,

#2 is the author first promoting a super simplistic "more sleep = better" idea and then contradicting himself,

#3 is misinterpreting a symptom as a cause

etc.

3 and 4 seem somewhat valid. 1 and 2 only apply to a minority of people so Walker’s statements are good advice for most people. 5 is just ridiculous, it’s reasonable to average 7-9 as a recommendation of 8 hours.

btw I didn't downvote you. Do you feel my questions are not productive to a useful conversation?

Walker makes strong arguments that you need a minimum of 8. He doesn't give much leeway. I've been fretting every time I get 7 hours of sleep for the past few months and try to make it up with naps in the day, even if I don't feel tired.

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