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en.dopl3r.com - 8 hours of sleep 6 hours of sleep 4 hours of sleep
What's the difference between getting 7 hours of sleep and 6 hours of sleep? - Quora
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Bedtime routine: how many hours of sleep do kids need? - Own It - BBC
Is 5 Hours Enough Sleep? How Much Sleep Should I Get?
8 Hours or 7 Hours of Sleep, What's the Difference? | SiOWfa15: Science in Our World: Certainty and Controversy
What does having less than 6 hours of sleep a day do to one's body? - Quora
Sleeping 6 Hours is Healthier Than 8 Hours? (Sports and Bodybuilding) - YouTube
University of California, San Diego: External Relations: News & Information: News Releases : Health
6 or 8 hours' sleep? | SiOWfa16: Science in Our World: Certainty and Controversy
Is 6 Hours of Sleep Bad? The Sleep Research May Surprise You
Can someone break down an 8-hour usual sleep, or break down a usual sleep such as what certain periods of sleep can do to our body? - Quora
