The Claim

Frequent daytime napping is associated with a 63% increased risk of ischemic heart disease, independent of nighttime sleep duration and obesity, suggesting that napping may reflect poor sleep quality or underlying cardiovascular stress.

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

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
39score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

People who take a lot of naps during the day might be more likely to develop heart problems, even if they sleep well at night and aren’t overweight—this could mean their sleep isn’t restful or their heart is under extra stress.

See the scientific wording

Frequent daytime napping is associated with a 63% increased risk of ischemic heart disease, independent of nighttime sleep duration and obesity, suggesting napping may reflect poor sleep quality or underlying cardiovascular stress.

What the research says

1 study

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

    This study found that people who nap during the day have a 63% higher chance of getting heart disease, even when you account for how much they sleep at night — which matches what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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