Natural Sleep and Its Seasonal Variations in Three Pre-industrial Societies: Current Biology

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I was surprised to find that when groups of humans that depend only on natural light to regulate their sleep cycles, they do not sleep more than we do.    Preindustrial societies in Tanzania, Namibia, and Bolivia show similar sleep parameters They do not sleep more than “modern” humans, with average durations of 5.7–7.1 hr They go to sleep several hours …