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Why Humans Are Supposed to Sleep in Two 4-Hour Phases
What Do Scientists Really Know About Polyphasic Sleep?
😵💫 55 HOURS OF NO SLEEP
How to Only Sleep 2 Hours Per Day
How Much Sleep Do You Really Need? - Professor Of Neuroscience
Are naps actually good for us? | Sleeping with Science
8 時間の睡眠は必要ではない理由を医師が解説します。
I Tried 90 Minute Sleep Experiment for 7 Days..
Elon Musk Shares How Many Hours of Sleep He Needs to Be Productive! | @MindMasteryX
How Much Sleep Do You Actually Need?
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😴睡眠のためにメラトニンを摂取する最適な時間!マンデル博士
What If You Sleep 2 Hours Less Every Night?
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Sleep deprivation can lead to a 300-400% increase in being depressed and anxious
The 90 Minute Rule for better Sleep!
How much sleep do you really need? | Sleeping with Science, a TED series
私たちに本当に必要な睡眠時間はどれくらいでしょうか?