Research

Hormonal

Sleeping more than 9 hours per day is associated with an increased risk of stroke, potentially due to poor sleep quality or underlying comorbidities.

If you consistently sleep more than 9 hours, consider consulting a doctor to rule out underlying issues like sleep apnea or inflammation, as this pattern is linked to a higher risk of stroke.

GoodSupportsMEDIUM confidence
Concerning long sleep duration, no effect was observed for the risk of chronic diseases in general, but it was shown to be associated with an increased risk of stroke (model 4: HR for $9 h/ day = 1.65, 95% CI: 1.00–2.73).
Anne von Ruesten et al. · PLoS ONE · 2012

Why this rating

Large cohort, but the association is specific to one endpoint (stroke) and the confidence interval touches 1.00.

Source

Association of Sleep Duration with Chronic Diseases in the European Prospective Investigation into Cancer and Nutrition (EPIC)-Potsdam Study

Anne von Ruesten et al. · PLoS ONE · 2012

DOI 10.1371/journal.pone.0030972

cohort · n=23620Cited 260×
Read the paper
DOI resolved against Crossref · corpus check 2026-06-10

This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →