Sleeping six hours or less daily is harmful to health.
the verdict
SUPPORTED
the evidence backs this
confidence 90/100
Extensive scientific literature, including umbrella reviews and large-scale cohort studies, consistently demonstrates that sleeping six hours or less daily is associated with adverse health outcomes, including increased cardiovascular risk, metabolic dysfunction, and higher all-cause mortality.
Evidence for · 7
Problems Associated with Short Sleep: Bridging the Gap between Laboratory and Epidemiological Studies
2009 · cited by 286
Highlights epidemiological and laboratory findings associating sleep durations of six hours or less per night with negative metabolic, neurobehavioral, and cardiovascular health outcomes.
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More for · 6
Effects of Sleep Deprivation on Physical and Mental Health Outcomes: An Umbrella Review
2025 · cited by 32
Concludes from an umbrella review that short sleep durations of under seven hours are linked to heightened risks of all-cause mortality, cardiovascular diseases, and metabolic disorders.
The U-Shaped Association between Sleep Duration, All-Cause Mortality and Cardiovascular Risk in a Hispanic/Latino Clinically Based Cohort
2023 · cited by 21
Demonstrates that a short total sleep time of six hours or less is significantly associated with increased all-cause mortality and 10-year cardiovascular risk.
The gendered health consequences of persistent exposure to short sleep duration during adolescence
2023 · cited by 5
Shows that persistent exposure to short sleep duration during adolescence is detrimental to health, notably increasing overweight risk and worsening self-rated health in girls over time.
Dietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.
2026 · cited by 3
Notes that failing to meet the recommended seven to nine hours of restful sleep per night increases the risk of various adverse health conditions.
Sleep Duration and Mortality in Women: Effect of Aging and Menopause.
2026 · cited by 0
Affirms that insufficient sleep is tied to higher death rates and cardiometabolic strain in women, with optimal health outcomes observed at seven to eight hours of nightly rest.
Acute sleep rebound following sleep restriction is associated with reduced mortality risk.
2026 · cited by 0
Finds that chronic short sleep without adequate rebound is associated with elevated mortality risks, particularly among short sleepers.