You know you need to get enough sleep, but the question remains: How much is enough? Sleep scientist Matt Walker tells us the recommended amount for adults and explains why it's necessary for your long-term health. Sleeping with Science, a TED series, uncovers the facts and secrets behind our nightly slumber. (Made possible with the support of Beautyrest) Check out more: go.ted.com/sleepingwithscience and subscribe to the TED channel: www.youtube.com/TED

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