Chronotypes: Evolution Explains Night Owls and Early Birds

🔄FROM THE ARCHIVE: Did you know that our sleep patterns may be linked to our evolutionary past? 🌅🦉 Learn more about chronotypes and why some of us are night owls while others are early birds in this fascinating article. sleepscience evolution

. I don’t know how the Hadza feel about all this poking and prodding, but I hope they’re okay with it, because they are providing science with a mass of data not otherwise available.

Out of more than 220 hours during which data was collected, there were only 18 minutes, spread out in one-minute increments among 20 nights, when all 33 participants were soundly asleep. On a per-night basis, roughly eight individuals in the group were awake at any given time. Meanwhile, having someone else in the group awake for a while and alert for lions and whatnot allows other individuals to get a chunk of quality sleep, which is crucial for cognitive functions, including memory.

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