A CPAP machine is used in the treatment of sleep apnea. This device delivers continuous pressurized air through tubing into a mask that you wear while you sleep. CPAP therapy is the leading treatment for sleep apnea. CPAP therapy keeps your airway open by gently providing air through a mask. CPAP stands for Continuous Positive Airway Pressure. CPAP therapy is considered the "gold standard" for treating obstructive sleep apnea (OSA) and has been found to be highly effective in treating the condition.