Humans Had TWO Sleep Cycles for Thousands of Years — Here's What Changed
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Humans Had TWO Sleep Cycles for Thousands of Years — Here's What Changed
Learn about everyday History. This "sleep documentary" explores the fascinating subject of "sleep history" through the ages. We investigate the historical context of how human sleep patterns were dictated by natural light and seasons before the advent of electric lighting, offering a calm look at how our ancestors rested. These "sleep stories ...
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