Scientist Explains How Some People Need Only 4 Hours of Sleep | WIRED
How much sleep do you really need? | Sleeping with Science, a TED series
Should you get 8 hours of sleep? | Andrew Huberman and Lex Fridman
What Happens If You ONLY SLEEP 4 Hours A Night for 30 Days?
Gravity Position - How to make 5 hours of sleep feel like 8.