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Scientist Explains How Some People Need Only 4 Hours of Sleep | WIRED
Why some people can thrive on less sleep – BBC REEL
How Sleep Affects Your Brain
The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
Why Humans Are Supposed to Sleep in Two 4-Hour Phases
How Much Sleep Do You Need? - Professor Of Neuroscience, Russel Foster
I Decided to Sleep for 4 Hours a Day, See What Happened
Understand SLEEP DEBT | Can you Train yourself to sleep only 4 - 5 hours a day | Dr.Education
How 4 Hour Sleep increased my Performance and Efficiency | Just Sharing Past 2 Years of Experience
How lack of sleep affects health and tips for a good night's rest