There's more than one reason to aim for a good night's sleep. Charles Taylor/iStockphoto.com hide caption
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All in the name of science: Volunteers hike in Colorado during their one-week hiatus from electrical lighting. Courtesy of Kenneth Wright hide caption
A towel covers the face of a man in a geriatric day care facility of the German Red Cross at Villa Albrecht in Berlin. Carsten Koall/Getty Images hide caption