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And only a few hundred years ago jaw size supposedly started shrinking leading to increased sleep disordered breathing, at least that's what some researchers claim.

Also, hunter-gatherer societies may get less sleep than the recommended. https://www.theatlantic.com/science/archive/2015/10/the-many... And the San and Tsimane may not have a word for insomnia because they have bigger airways?

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I think jaw size is probably related to the foods we eat. (Less reason to develop a strong jaw if you aren’t eating tough stuff) At least, that’s what I read on HN some months back. It’s why our teeth need more alignment too. Not enough space.

It's also related to how long breastfeeding is continued and to whether you have allergies (or other reasons to start mouth breathing).

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