Blame evolution for your lack of sleep.

A team of Duke University researchers compared the sleep habits of humans with hundreds of mammals, including primates, and found that humans sleep for significantly fewer hours than our closest relatives.

While humans may snooze less, the study found that our sleep is actually more efficient, and more time is spent in the deep stages of sleep.

Duke anthropologists David Samson and Charlie Nunn, who authored the paper, combed through the literature on sleep habits of mammals and 21 species of primates according to Duke Today.

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