Myth: "Eleven or 12 hours of sleep a night will do the trick." Heather Graham recently told "People" that she needs 11 to 12 hours of sleep every night to look her best. While most doctors agree that a good night's sleep is necessary for your health, there's no "more is always better" rule. "Everyone needs different amounts of sleep," says Lipman. "Some people need six hours, some people need eight hours -- 12 hours is a little much. Usually between six and nine is right." A study conducted by the Sleep, Health, and Society program at the University of Warwick -- which analyzed data on 1.5 million people -- confirmed that both too little and too much sleep can be harmful, and even lead to premature death.
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