How does PAP or "CPAP" therapy work? CPAP (Continuous Positive Airway Pressure) treats OSA by providing a gentle flow of positive-pressure air through a facial mask to keep the airway open during sleep. As a result: - Breathing becomes regular during sleep - Snoring stops - Restful sleep is restored - Quality of life is improved - Risk for high blood pressure, heart disease, heart attack, stroke, and motor vehicle and work accidents is reduced