Frequent or usual daytime napping in adults was associated with a 12% higher risk of developing high blood pressure and a 24% high risk of having a stroke compared to never napping. Experts say napping, though not unhealthy, may be a sign of poor sleep quality. A higher percentage of frequent nappers were men, had lower education and income levels, and reported cigarette smoking, daily drinking, insomnia, snoring and being an evening person compared to people who reported napping sometimes or never. The Mendelian randomization result shows that if napping frequency increased by one category (from never to sometimes or sometimes to usually) high blood pressure risk increased 40%.
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Source: ScienceDaily