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Study: Humans Evolved to Sleep Less, Better

Humans are efficient sleepers, and that's why we need less sleep - seven hours - compared to as much as 14 hours a day for our closest animal relatives, Researchers at Duke University compiled a database of sleep patterns of hundreds of mammals, including 21 primate species. They found that not only do humans need less sleep than chimps, macaques and lemurs, we spend a greater percentage of our slumber in the deeper, more restorative stages of sleep. That might not seem surprising...

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