Seven Hours -- The Magic Number for Sleep?

People who sleep either more or fewer than seven hours a day, including naps, have an increased risk for cardiovascular disease, according to a new study.

Sleeping fewer than five hours a day more than doubles your risk of being diagnosed with angina, coronary heart disease, heart attack or stroke.  And sleeping more than seven hours also increases the risk of cardiovascular disease; more than nine hours of sleep results in a 50 percent increase in the risk.

The Daily Telegraph reports:

"The most at-risk group was adults under 60 years of age who slept five hours or fewer a night. They increased their risk of developing cardiovascular disease more than threefold ... Women who skimped on sleep ... were more than two-and-a-half times as likely to develop cardiovascular disease."

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