If you usually sleep less than 6 hours a night and start getting 7 to 8 hours instead, you’re less likely to develop heart disease—so getting enough sleep might help keep your heart healthy.

39

Pro

0

Against

Evidence from Studies

Supporting (1)

39

Community contributions welcome

39

Causal association between sleep duration, daytime napping, sleep disorders and ischemic heart disease: A systematic review and meta‑analysis of Mendelian randomization studies

Systematic Review With Meta-Analysis

Human

2025 Dec

This study found that people who sleep more than 6 hours a night — ideally 7 to 8 hours — have a lower risk of heart disease, which matches exactly what the claim says.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Causal association between sleep duration, daytime napping, sleep disorders and ischemic heart disease: A systematic review and meta‑analysis of Mendelian randomization studies

Score: 39

DOI: 10.1016/j.ijcha.2025.101811

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Sleeping more than 9 hours a night doesn’t make your heart healthier—once you’re getting 7 to 8 hours, sleeping longer won’t lower your risk of heart disease.

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