The most effective and widely accepted treatment for sleep apnea is Continuous Positive Airway Pressure (CPAP) therapy. CPAP has proven to be the most effective treatment for moderate and severe Obstructive Sleep Apnea. A CPAP system consists of a small, quiet air pump, and a mask that fits over your nose or nose and mouth during your sleep. The pressure from the air-pump forces just enough air through the upper airway to prevent the airway from collapsing during sleep.