The American College of Physicians urges doctors to recommend overnight sleep tests for anyone with unexplained daytime sleepiness. That sleepiness may be the result of a condition called obstructive sleep apnea (OSA). The condition occurs when the muscles in the back of the throat relax too much during sleep. This lets the tissues around the throat close in and block the airway, causing a person to stop breathing for a few seconds. These stop-breathing episodes can occur dozens of times per hour.
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