Optimal sleep varies for each person

Recent studies are questioning the validity of the belief that everyone needs eight hours of sleep daily. Evidence shows that sleep needs can vary depending on age and individual circumstances. Research on hunter-gatherer communities—who lead lifestyles with minimal exposure to artificial light—indicates that their average sleep duration ranges from approximately 5.7 to 7.1 hours. These people stay alert and wake up at dawn without requiring long naps during the day. Studies suggest that the optimal sleep duration for health may fall between 6.4 and 7.8 hours, though individual needs vary. The American Sleep Institute recommends that adults aim for between seven and nine hours of sleep, recognizing that some individuals may naturally sleep six hours or less, or more, and still feel satisfied. Therefore, there is no one-size-fits-all rule; individual differences and age should be taken into account. The ideal sleep is the one that provides the best health outcomes and minimizes the risks associated with too little or too much sleep.

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