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Hit the Sack
Seven to eight hours of shut-eye a night is ideal, research shows. "Sleep deprivation increases the risk of heart disease, obesity, and diabetes, and weakens your immune system," explains Dr. Liponis. To achieve the deepest rest, he recommends sleeping in a cool, pitch-dark room—use eyeshades for a blackout effect if you need to.Escape Travel Sleep Mask, $20; dreamessentials.com.
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