Obstructive sleep apnea (OSA) is a common medical problem that involves temporary interruptions of airflow while sleeping. Typical symptoms of OSA include snoring; pauses in the patient's breathing while asleep, as witnessed by others; and excessive sleepiness during the daytime. It may be treated by wearing a mask that gently blows air into the nose or mouth to prevent the interruption of airflow while sleeping, a treatment called continuous positive airway pressure (CPAP). In addition to daytime fatigue and other health problems, OSA is known to increase the risk for death in men due to cardiovascular problems (such as heart attacks). Treatment with CPAP can reduce that risk. Much less is known about the risk of OSA to women.