One of the biggest myths about exercise is that you need 8 hours of sleep a night. In reality, sensors placed on people without modern technology (no electricity, TV, phones) show they sleep 6–7 hours and don't nap; epidemiological data reveals a U-shaped curve where 7 hours is optimal for most people, and oversleeping is associated with worse health outcomes.
factualpending
Speaker
Daniel LiebermanEvidence Quote
“when you put sensors on people who don't have any electricity, they don't have TVs, and they don't have phones... they sleep like 6 to 7 hours a night... this idea that natural human beings sleep 8 hours a night is just is just nonsense... people actually do better if they sleep 7 hours rather than 8 hours.”
Source
Harvard Professor: REVEALING The 7 Big LIES About Exercise, Sleep, Running, Cancer & Sugar!!!— The Diary Of A CEOCreated: 8/12/2026, 6:22:05 PM
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