結果 : does old people need less sleep
2:13

Study helps explain sleep problems in the elderly

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4:39

Why some people can thrive on less sleep – BBC REEL

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How much sleep do you really need? | Sleeping with Science, a TED series

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Science Explains How Much Sleep You Need Depending on Your Age

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How Much Sleep Do You Actually Need?

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Yoga Guru - Hansaji | How many hours should you sleep?

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How lack of sleep affects health and tips for a good night's rest

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Why 4 Hours Of Sleep Is Terrible For You — Even If You Don't Feel Tired

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How Sleep Changes as We Age

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I Can't Sleep for More Than 4 Hours a Night - Why? | This Morning

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Scientist Explains How Some People Need Only 4 Hours of Sleep | WIRED

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What Happens to Your Body on Little Sleep?

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