Blog
The latest data and interpretations — short, with numbers and sources.
- Data
Caffeine and sleep: what the half-life numbers say
Caffeine's half-life is about 5–6 hours. We plug in real doses and show how much is still in your body at 11pm if you drink coffee in the afternoon.
1 min read - Interpretations
The sleep-mortality U-curve: how to read it
Both short and long sleep track with higher risk. But correlation is not cause — here is what the curve tells you, and what it does not.
1 min read
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