Excessive sleep duration causes long-term damage to brain and heart health.
Multiple studies and meta-analyses demonstrate that excessive or long sleep duration is significantly associated with increased cardiovascular disease mortality and adverse long-term health outcomes.
The claim that excessive sleep duration is detrimental to health is well-supported by epidemiological and meta-analytic evidence linking long sleep to heightened cardiovascular mortality and overall mortality risk. The retrieved papers consistently report associations between long sleep (>7-8 hours) and negative health indicators such as increased cardiovascular death and mortality following stroke.
Feicheng Ye, Jing Liu, Shuguang Zhang, Xu Han. Association between sleep duration and cardiovascular disease specific mortality: A meta-analysis. 2022. https://doi.org/10.54029/2022yry
A meta-analysis found that long sleep duration is significantly associated with an increased risk of cardiovascular disease-specific mortality.
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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
Review evidence indicates that excessive sleep duration follows a U-shaped risk curve, being tied to higher death rates and cardiometabolic strain.
Sara Hassani, Bruce Ovbiagele, Daniela Markovic, Amytis Towfighi. Sleep Duration and Long-Term Mortality After Stroke: A Nationwide Analysis. 2023. https://doi.org/10.1101/2023.12.11.23299835
A nationwide study of stroke survivors established that long sleep duration is independently associated with higher all-cause mortality.
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