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Lumifer comments on Crazy Ideas Thread - Less Wrong
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No, because sleep is tied to the diurnal cycle and the success of a hunt (for carnivores) cannot be so conveniently arranged.
Is it? Domesticated dogs derive from a nocturnal species, when born feral they are nocturnal, but have no problems being diurnal when raised so by humans. Humans can easily adapt to two shorter sleeps or even the weird polyphasic routine.
OTOH "food coma" is a thing.
Not sure this is true. In the tropics (where there are a lot of feral dogs) the peaks of activity for most everyone is dawn and dusk, avoiding the midday heat. As far as I know nocturnal predators certainly exist but are rare.
Don't know about that either. Humans can adapt. Some humans can easily adapt. A lot can't.