ナショナルジオグラフィックのインスタグラム(natgeo) - 5月14日 07時03分

Photo by @beverlyjoubert | We humans tend to sleep for around seven hours a day … and that’s actually a short snoozing interval when compared to other primates–and yet we also tend to sleep more deeply and soundly. For smaller members of the primate family, like baboons, slumber is a much more fretful and fragmented affair. Since they don’t make use of sleeping platforms (like chimps and orangutans do), baboons’ resting hours are usually spent balancing uncomfortably up in trees, always on guard for potential threats. And the quality of sleep has evolutionary consequences. It’s possible that the transition to sleeping in specially constructed platforms, and later around campfires on the ground, is what allowed humans to trade sleep quantity for sleep quality–and the extra waking hours gave our species an evolutionary advantage. #baboons #apes #evolution

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