A continuous positive airway pressure (CPAP) machine is the most commonly prescribed method for treating sleep apnea. This medical device sends a steady flow of oxygen into your mouth and nose while you sleep, which keeps your airways open and allows you to breathe more normally.
CPAP machines have motors that generate a constant stream of pressurized air which travels through an air filter and into a flexible tube. The tube delivers purified air into a mask that you seal around your nose or mouth while you sleep.