Too Much, Too Little Sleep Affects Cardio Outcomes

Risk for coronary heart disease, stroke higher with less than five hours', more than nine hours' sleep

MONDAY, Feb. 14 (HealthDay News) -- Both short and long sleep duration are associated with increased risk for cardiovascular events, according to research published online Feb. 7 in the European Heart Journal.

Francesco P. Cappuccio, M.D., of the University of Warwick in Coventry, U.K., and colleagues analyzed data from 15 studies involving 474,684 men and women to study the relationship between sleep duration and morbidity and mortality related to coronary heart disease (CHD), stroke, and total cardiovascular disease (CVD).

The researchers found short sleep duration, usually five hours or less, associated with a higher risk for development of or death from CHD and stroke, but not total CVD. Long duration of sleep, usually more than nine hours, was associated with a higher risk for all three.

"Currently, there is no evidence that sleeping habitually between six and eight hours per day in an adult is associated with harm and long-term health consequences. However, sleeping nine hours or more per night may represent a useful diagnostic tool for detecting subclinical or undiagnosed comorbidity. People reporting consistently sleeping five hours or less per night should be regarded as a higher risk group for cardiovascular morbidity and mortality," the authors write.

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