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    Getting Headaches? You Can't Sleep on It

    By
    WebMD Health News

    June 26, 2000 -- The attacks can come on without warning -- a stabbing pain on one side of your head, intense pain in and around one eye, a stuffy nose -- and you usually feel worse when lying down. The pain usually lasts up to an hour and then disappears, only to return again.

    Doctors still don't know what actually causes these headaches, often called cluster headaches, but a new study has found that they may be triggered by a sleep disorder that also interferes with your breathing.

    "Cluster headaches are a terrible problem, and people who get them know that they're looking at a month of having recurrent attacks," says Todd Troost, MD. "For some people it just goes on and on. This study is very interesting because it may give us information on how to prevent them from occurring." Troost, who is chairman of the neurology department at Wake Forest University School of Medicine, was not involved in the study.

    Unlike migraines, which affect mostly women, cluster headaches primarily afflict men. While they can strike during the daytime, most of them tend to occur at night, usually waking the person from a sound sleep. Researchers from the University of Michigan found that 80% of the people in their study, which appears in the June 27 issue of the journal Neurology, may have a sleeping disorder known as obstructive sleep apnea, which might be responsible for triggering the attacks.

    Obstructive sleep apnea is believed to affect the health of about 20% of the adult population in the U.S., even though most people remain undiagnosed. It occurs when a person's airway becomes blocked while sleeping. This causes breathing to stop temporarily, which awakens the person briefly. This pattern is then repeated throughout the night, and the number of involuntary breathing pauses may be as high as 20 to 30 or more per hour.

    The researchers assessed 25 individuals who had a history of cluster headaches, using a sleep test called polysomnography, which monitors brain waves, heart rate, breathing patterns, oxygen level, and muscle movements while a person is asleep. The results of the polysomnography indicated that up to 80% of the study subjects had some degree of sleep apnea.

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