Key result
Extreme sleep durations link to ~10% higher stroke risk compared to normal sleep.
Why the study?
There is uncertainty about the optimum sleep duration for risk of different subtypes of stroke and ischaemic heart disease.
Cohort (n=409,156)
Yes
Hazard Ratio: 1.1 (95% CI 1.04–1.16)
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Extreme sleep durations flag higher stroke and coronary risks; leaves open causality and whether sleep modification alters outcomes.
Chen et al. (2023) conducted a cohort in Stroke and coronary heart disease (n=409,156). Very short sleep duration (≤ 5 hours) vs. 7-8 hours of sleep was evaluated on Total stroke (HR 1.10, 95% CI 1.04-1.16). Compared to 7-8 hours of sleep, very short (≤ 5 hours) and very long (≥ 10 hours) sleep durations were associated with an increased risk of total stroke (HR 1.10 and HR 1.12, respectively).
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