The risk of stroke was 14 percent higher for women who regularly slept six hours or less, compared to those sleeping seven hours a night.

The study, to be published online July 18 in the journal Stroke, was led by Dr. Jiu-Chiuan Chen, an assistant professor of epidemiology at the University of North Carolina School of Public Health.

A number of studies have documented adverse effects of sleep deprivation, Chen said, and this report adds to that evidence.

"There have also been many studies showing a link between abnormally long sleep and an increased risk of cardiovascular disease and high blood pressure," he said.

Similar findings have been seen in studies of other groups of people, said Dr. Adnan I. Qureshi, professor of neurology, neurosurgery and radiology at the University of Minnesota Medical School, who has done some of those studies.

"If you sleep too much or sleep too little, it seems your risk of stroke goes up," said Qureshi. "This is not explained by traditional risk factors such as cholesterol levels or high blood pressure."

It isn't clear why sleep affects stroke risk, but there are several possible explanations, he said. One is that people who report long hours of sleep may have "ineffective sleep," because their periods of sleep are broken up by unnoticed wakenings, sometimes due to the breathing disorder called sleep apnea."Or you may be looking at a psychosocial profile," Qureshi said. "People who have depression tend to sleep longer."

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