Sleep Duration Effects on Cardiovascular Health

Sleep duration exhibits a consistent U-shaped relationship with cardiovascular outcomes, whereby both insufficient and excessive sleep correlate with elevated risk of coronary events, stroke and all-cause mortality. Habitual short sleep contributes to hypertension, systemic inflammation, impaired glucose metabolism and heightened sympathetic activity, while prolonged sleep may indicate underlying disease processes or circadian misalignment that exacerbate vascular dysfunction. Large-scale epidemiological studies suggest that an average of 7–8 hours of sleep per night aligns with optimal endothelial health, whereas deviations from this range are associated with subclinical atherosclerosis, adverse lipid profiles and elevated risk scores. Research has further highlighted interactions between sleep duration and sleep quality, age and sex, underscoring sleep as a modifiable determinant in the prevention and management of cardiovascular disease at a global scale.

Research from Nature Portfolio

In a Middle Eastern cohort exceeding 10 000 adults, individuals reporting fewer than six hours of sleep per night exhibited significantly higher prevalence of cardiovascular disease, coronary heart disease and hypertension, as well as elevated Framingham risk scores, compared with those sleeping six to eight hours. Sleep durations beyond nine hours did not confer additional cardiovascular risk in this population. A large prospective Chinese study explored the combined influence of sleep quality and duration on stroke risk. Short (<6 hours) or long (>8 hours) sleep combined with poor subjective sleep quality yielded synergistic increases in stroke incidence, with risk ratios exceeding 2.5 in some subgroups and additive interactions particularly pronounced in mid-life adults. A nationwide analysis of nearly two million Japanese adults demonstrated that good self-reported restfulness from sleep was independently associated with lower incidence of myocardial infarction, angina, stroke, heart failure and atrial fibrillation. Protective associations were strongest among younger individuals and women, suggesting demographic variation in restorative sleep benefits.

Sleep Duration Effects on Cardiovascular Health publication trend

The graph below shows the total number of articles in sleep duration effects on cardiovascular health across all publications each year (not limited to Nature Index journals).

Technical terms

Hazard ratio: A relative measure comparing the rate of an event occurring in one group versus another over time.

Framingham risk score: A clinical tool estimating an individual’s 10-year risk of cardiovascular events based on traditional risk factors.

U-shaped association: A relationship in which both low and high values of an exposure correspond to increased outcome risk, relative to intermediate values.

References

1. Short sleep is associated with higher prevalence and increased predicted risk of cardiovascular diseases in an Iranian population: Fasa PERSIAN Cohort Study. Scientific Reports (2020).
2. Interactive effect of sleep duration and sleep quality on risk of stroke: An 8-year follow-up study in China. Scientific Reports (2020).
3. Restfulness from sleep and subsequent cardiovascular disease in the general population. Scientific Reports (2020).
4. Sleep Patterns and the Risk of Acute Stroke. Neurology (2023).
5. Associations between sleep duration and cardiovascular diseases: A meta-review and meta-analysis of observational and Mendelian randomization studies. Frontiers in Cardiovascular Medicine (2022).
6. Sleep Duration/Quality With Health Outcomes: An Umbrella Review of Meta-Analyses of Prospective Studies. Frontiers in Medicine (2022).