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WASHINGTON - Regularly getting nine hours or more of sleep per night may increase the risk of stroke in postmenopausal women, according to a study published on last Thursday.

Only 5 percent of the 93,000 women in the study, who were 50 to 79 years old and from 40 locations around the United States, reported getting nine hours or more of sleep nightly.

But they had a 60 percent to 70 percent higher risk of stroke compared to women getting seven hours of sleep per night, the most common sleep duration, the researchers wrote in the American Heart Association journal Stroke.

The researchers statistically accounted for known risk factors for stroke and still found the increased risk in the longer-sleeping women.

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