Health routines
A month without days
In 1938, a sleep scientist went deep underground to test whether the human day could be stretched to 28 hours. Research and a bestselling book on sleep show what the body clock allows, and where claims run ahead of the evidence. This is a story and research, not health advice.
Major #38: NeuroscienceThe story: Nathaniel Kleitman (1930s). The book: Why We Sleep by Matthew Walker.
In this lesson
- A world without days
- Down into Mammoth Cave
- What the research says
- The book: Why We Sleep
- What the evidence says about the book
- Where this comes from
- Try it today
- 4 questions to check yourself