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The Passion for Sleep
"I think the global sleep loss epidemic is perhaps one of the greatest public health challenges that we now face in the 21st century," he says. "It took Mother Nature 3.6 million years to put this essential thing called 8 hours of sleep in place, and we've just done away with 20%, 25% of that." The average U.S. adult was sleeping 7.9 hours a night in 1942; today it's only 6 hours and 31 minutes.