"It’s basically like sleeping with one eye open because your Spidey senses are constantly on," says Sara Mednick, a professor of cognitive sciences at the University of California, Irvine, and the author of the upcoming book The Power of the Downstate: Recharge Your Life Using Your Body's Own Restorative Systems. When you're in a hotel, "you’re in a new environment—new bed, new smells, new sounds," as Mednick puts it. … "Part of sleep is just habit," says Mednick. "Keep your evening rituals as much as possible, and make the hotel setting in time and space and habits as close [to home] as possible." 

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