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The human sleep paradox is the result of our evolutionary history
To learn about how ancient humans slept, anthropologists study contemporary non-industrial societies, such as the Hadza hunter-gatherers of Tanzania and various groups in Madagascar, Guatemala, and elsewhere. Sleep across all three groups averages around 5.7 - 7.1 hours, which is much less than primates.
Evolutionary anthropologist David Samson thinks the evolution of human sleep is a story about safety in numbers when humans began sleeping on the ground and napping often.
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Humans need less sleep
The San hunter-gatherers of Namibia have no electric lights or new Netflix releases that keep them awake. Yet, they don't sleep more than the typical Western city-dweller who stays up doom-scrolling on their smartphone.
- Research shows that people in non-industrial soci...
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Unsatisfied sleepers
How much we sleep is different from how much we wish we slept. Research from 2017 shows that out of 37 people, 35 said they slept just enough. On average, they slept about 6.25 hours a night. But they awoke frequently and needed more than 9 hours in bed to get those 6.25 hours.
By contrast,...
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Human sleep isn't exceptionally short
The threat of predators may have led humans to sleep less than tree-living primates. Yet, scientists point out that existing data about sleep in primates come from captive animals, who may sleep more because the animals are bored.
Having data from more wild animals would help sleep research...
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