Increased sleep need

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2 studies · 1 recommendation

Last updated: February 25, 2026

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Sudden increase in sleep duration may signal elevated future stroke risk

A shift from average to prolonged sleep duration serves as an early warning marker for stroke. In the EPIC-Norfolk cohort study of 9,692 participants tracked over 9.5 years (346 stroke events), those who transitioned from average to long sleep had a hazard ratio of 1.46 (95% CI 1.08–1.98) for stroke. An accompanying meta-analysis confirmed the association, with a pooled HR of 1.45 (95% CI 1.30–1.62) for long sleep and stroke risk. This pattern held even among apparently healthy individuals without preexisting conditions. A noticeable, sustained increase in sleep need—beyond normal fatigue—warrants prompt medical evaluation to assess underlying cerebrovascular risk factors.

Evidence

Sleep duration and risk of fatal and nonfatal stroke : a prospective study and meta-analysis

Authors: Brayne, Carol, Cappuccio, Francesco, Khaw, Kay-Tee, Leng, Yue, Luben, Robert N., Surtees, Paul G., Wainwright, Nick W. J.

Published: March 17, 2015

In the EPIC-Norfolk cohort of 9,692 participants with sleep duration reported at two time points (1998-2000 and 2002-2004), those who shifted from average to long sleep duration over time had higher stroke risk compared to persistently average sleepers. Long sleep was associated with an HR of 1.46 (95% CI 1.08-1.98) for stroke over 9.5 years of follow-up with 346 stroke events. The study concluded that prolonged sleep serves as a potentially useful early marker of increased future stroke risk in an apparently healthy aging population, even among those without preexisting conditions.

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Sleep duration and risk of fatal and nonfatal stroke: a prospective study and meta-analysis.

Authors: Brayne, Carol, Cappuccio, Francesco P, Khaw, Kay-Tee, Leng, Yue, Luben, Robert, Surtees, Paul G, Wainwright, Nick WJ

Published: February 25, 2015

In the EPIC-Norfolk cohort of 9,692 participants with sleep duration measured at two time points (1998-2000 and 2002-2004), those who reported a substantial increase in sleep duration over time had higher stroke risk compared to persistently average sleepers. Persistently long sleepers also showed elevated risk. Over 9.5 years of follow-up, 346 stroke events occurred. The meta-analysis pooled HR for long sleep and stroke was 1.45 (95% CI 1.30-1.62). The authors concluded that prolonged sleep is a potentially useful marker of increased future stroke risk in apparently healthy aging populations.

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