A continuous positive airway pressure (CPAP) machine is the most commonly prescribed device for treating sleep apnea disorders. Obstructive sleep apnea (OSA) causes interruptions or pauses in your breathing, often because your throat or airways briefly collapse or something temporarily blocks them. A CPAP machine sends a steady flow of pressurized air into your nose and mouth as you sleep. This keeps your airways open and helps you breathe normally. Let’s take a closer look at how this machine works, the pros and cons of using one, and other options for sleep apnea.