Sleeping six hours or less daily is harmful to health.
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.
The retrieved papers overwhelmingly support the claim that sleeping six hours or less daily is harmful to health. Multiple high-quality sources, including umbrella reviews, prospective cohort studies, and population-wide longitudinal studies, link short sleep duration (typically defined as ≤6 hours or <7 hours) to increased all-cause mortality, cardiovascular disease, metabolic disorders, and poorer psychological or self-rated health outcomes. There are no papers refuting this consensus among the retrieved set.
M. Grandner, Nirav P. Patel, P. Gehrman, M. Perlis, A. Pack. Problems Associated with Short Sleep: Bridging the Gap between Laboratory and Epidemiological Studies. 2009. https://doi.org/10.1016/j.smrv.2009.08.001
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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Arambh Sanjay Shah, Mitresh Raj Pant, T. Bommasamudram, K. Nayak, Spencer S. H. Roberts, Chloe Gallagher, K. Vaishali, B. J. Edwards, David Tod, Fiddy Davis, S. Pullinger. Effects of Sleep Deprivation on Physical and Mental Health Outcomes: An Umbrella Review. 2025. https://doi.org/10.1177/15598276251346752
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.
Mario Henríquez-Beltrán, J. Dreyse, J. Jorquera, Jorge Jorquera-Díaz, Constanza Salas, Isabel Fernandez-Bussy, G. Labarca. The U-Shaped Association between Sleep Duration, All-Cause Mortality and Cardiovascular Risk in a Hispanic/Latino Clinically Based Cohort. 2023. https://doi.org/10.3390/jcm12154961
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.
Gum‐Ryeong Park, Jinho Kim. The gendered health consequences of persistent exposure to short sleep duration during adolescence. 2023. https://doi.org/10.1002/jad.12203
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.
Conti F. Dietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.. 2026. https://doi.org/10.1093/nutrit/nuaf062
Notes that failing to meet the recommended seven to nine hours of restful sleep per night increases the risk of various adverse health conditions.
Ji M, Full KM, Laratta CR, Malhotra A. Sleep Duration and Mortality in Women: Effect of Aging and Menopause.. 2026. https://doi.org/10.1016/j.jsmc.2026.02.008
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.
Li X, Zhang M, Li Z, Zhang S, Bertisch SM, Huang T, Rutter MK, Redline S. Acute sleep rebound following sleep restriction is associated with reduced mortality risk.. 2026. https://doi.org/10.1038/s41467-026-72461-1
Finds that chronic short sleep without adequate rebound is associated with elevated mortality risks, particularly among short sleepers.
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