How Long Do Hunter-Gatherers Sleep?

Paleobetic diet
Probably needs 8 hours a night, if not more. And why is the light on?!

From The Lancet Neurology:

Prospective epidemiological studies in industrial societies indicate that 7 h of sleep per night in people aged 18 years or older is optimum, with higher and lower amounts of sleep predicting a shorter lifespan. Humans living a hunter-gatherer lifestyle (eg, tribal groups) sleep for 6-8 h per night, with the longest sleep durations in winter. The prevalence of insomnia in hunter-gatherer populations is low (around 2%) compared with the prevalence of insomnia in industrial societies (around 10-30%). 

Fun fact: Adult horses only sleep for 3-5 hours per day. And in a herd, there’s usually one “standing watch” for predators while the others sleep.

Steve Parker, M.D.

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