Sleep research challenges 8-hour standard and links patterns to health risks

New research is challenging the universal assumption that all adults require exactly eight hours of sleep per night. A review published in Brain Medicine suggests that optimal sleep duration varies significantly between individuals based on age, health status, and lifestyle, with estimates ranging from 6.4 to 7.8 hours.

Studies of hunter-gatherer communities in Tanzania, Namibia, and Bolivia indicate that pre-industrial sleep patterns often averaged between 5.7 and 7.1 hours. While general scientific guidelines still recommend 7 to 9 hours for most adults, researchers emphasize that sleep quality, regularity, and timing are as critical as total duration.

Additionally, a study by researchers at Peking University People's Hospital, published in Neuropsychiatric Research, has identified a link between sleep patterns and the risk of hemorrhoids. Using Mendelian randomization to analyze genetic data from the UK Biobank and FinnGen, researchers found that insomnia is associated with a 23% higher risk of the condition. Longer sleep duration was linked to a 16% increased risk, while a genetic predisposition for midday napping was associated with a 14% higher risk.