人間はなぜ4時間ずつ2回に分けて眠る必要があるのか
Do You Really Need 8 Hours of Sleep Every Night? | Body Stuff with Dr. Jen Gunter | TED
Are naps actually good for us? | Sleeping with Science
How Much Sleep Do You Actually Need?
What Do Scientists Really Know About Polyphasic Sleep?
Hypersomnia, Causes, Signs and Symptoms, Diagnosis and Treatment.
I Can't Sleep for More Than 4 Hours a Night - Why? | This Morning
The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
Why you're still tired after getting 8 hours of sleep
How many hours of sleep a night do I need?
How much sleep do you really need? | Sleeping with Science, a TED series
Do Depressed People Need More Sleep? How To Do Wake Therapy
眠ると何が起こるのでしょうか?
8 時間の睡眠は必要ではない理由を医師が解説します。
ロジャー・フェデラーが1日12時間眠る理由 | 神経科学者マシュー・ウォーカー
How Much Sleep Do You Really Need? - Professor Of Neuroscience
What is melatonin -- and should you take it to fall asleep? | Sleeping with Science
What Can Cause Me to Sleep Too Much?
How to Only Sleep 2 Hours Per Day
Why Do I Feel So Sleepy Despite Having Enough Sleep? – Dr. Berg