Go to 60 Minutes/Yahoo original
Tired of being tired? You're not alone. On average, Americans say they get less than seven hours of sleep each night. Still, we spend nearly one-third of our lives asleep, so it's not surprising that a great many researchers are exploring its many mysteries. What is surprising, however, is the new evidence about sleep's impact on health, aging, memory and even sex! Lesley Stahl reports.
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