FLAME with Brad Hook
The Science of Sleep, Aging, and Living Better for Longer
What if sleeping too much is almost as bad for you as sleeping too little? Columbia's Dr Junhao Wen maps how sleep duration shapes biological aging across 23 organ systems — and where the real sweet spot sits.
Hao's research, published in Nature, uses biological aging clocks to ask a precise question: how does sleep duration relate to how fast your organs are actually aging? The answer is a U-shaped curve — both short and long sleep are associated with faster aging, with a sweet spot around 6.4 to 7.8 hours. But the more interesting part is his caution: that range is a starting framework, not a rule, and it differs for women and men.
The conversation digs into a subtlety most headlines miss: long sleep may be a warning light rather than a cause — the body asking for more because something else is wrong. And for anyone tracking their sleep score a little too anxiously, there's a grounded message here about using the data without letting it use you. A practical, hype-free episode on sleep, longevity and staying human in the age of AI-driven medicine.
In this episode
- What a biological aging clock actually measures
- The U-shaped curve: both short and long sleep speed up aging
- 6.4–7.8 hours — a starting framework, not a rule
- Why long sleep may be a symptom, not a cause
- How the optimal range differs for women and men
- Sleeping better without sleep-score anxiety
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