"Different patterns of slumber and wakefulness in each of these groups highlight the flexibility of human sleep — and also point to potential health dangers in how members of Western societies sleep...
Hadza adults tended to hit the sack — or, more commonly, the mat — shortly after midnight and nap in the early afternoon. Malagasy villagers napped once or twice during the day’s hottest hours, usually starting around noon, and retired in the early evening. At night, they slept in two phases, awakening for around an hour shortly after midnight. Historical accounts describe a similar sleep pattern among Western Europeans between 500 and 200 years ago — two sleep segments, divided by a period of activity or reflection"
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