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Not Everyone Needs 8 Hours Sleep
Researchers from the University of California have revealed that sleep needs vary among individuals. Members of pre-industrial societies typically sleep between 5.7 and 7.1 hours per night, which contradicts the common assumption of an 8-hour sleep requirement. Studies have shown that sleep patterns are highly flexible, with participants waking near dawn without alarms, regardless of the day of the week. It is estimated that the average sleep duration in these communities is about 6.4 hours at night. It becomes clear that both the timing and quality of sleep are just as important as the number of hours, and that a fixed, universal sleep schedule is not an absolute evolutionary norm.
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