Long-term sleeping during the day damages human health
the verdict
SUPPORTED
the evidence backs this
confidence 57/100
Multiple recent studies and umbrella reviews indicate that prolonged or excessive daytime sleeping (typically over 30 to 60 minutes) is associated with negative health outcomes, including increased risks of metabolic syndrome, chronic disease, biological aging, and all-cause mortality.
Evidence for · 4
Sleep duration, daytime napping and the risk of incident metabolic syndrome vary by age and sex: findings from the China health and retirement longitudinal study.
2025 · cited by 3
Longer daytime napping (>30 min/day) was significantly associated with a higher risk of developing metabolic syndrome.
Evidence against · 1
Associations between daytime napping and parameters of ovarian reserve among women undergoing assisted reproductive technology.
2026 · cited by 0
Daytime napping of one hour or less was inversely associated with certain hormone levels, suggesting a potentially beneficial profile for ovarian reserve under specific conditions.
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More for · 3
Multiple Health Outcomes of Daytime Napping: A Comprehensive Umbrella Review
2026 · cited by 2
Napping for >60 minutes correlates with a 30% higher risk of coronary heart disease and a 20% increased risk of diabetes and obesity.
Distinct roles of chronotype, daytime napping, and sleep duration in biological and functional aging: a univariable and multivariable Mendelian randomization study.
2026 · cited by 0
Mendelian randomization analysis indicates that excessive daytime napping causally influences accelerated biological aging indicators like GrimAge and frailty.
Objectively Measured Daytime Napping Patterns and All-Cause Mortality in Older Adults.
2026 · cited by 0
Actigraphy-measured longer and more frequent daytime napping in older adults are associated with higher all-cause mortality.