Hm, I can excerpt the bits you may want when I get back home, or you can libgen it and have a look
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It's like Deutsch's point about good explanations being hard to vary. All of our sleep "explanations" are way too easy to perturb.
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The one thing with evo explanations (and the abundance of just so stories) is that they are not hard to vary, because there are various ways to achieve one end, evolution is somewhat random, there are spandrels, etc. There may be no reason why sleep instead of X, just chance and
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That's a substantial part of it! So many weird physiological changes (& multiple sleep states); the claimed benefits could plausibly be achieved in less costly ways, that didn't involve debilitating us for a third of the day.
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Sleep or things like it are pretty conserved in nearly all vertebrates and even most chordates. So maybe "Why do central nervous systems sleep?" is a better question/paper title.
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