CPAP device. This device is programmed to produce pressurized air at one steady air pressure level. To change the air pressure, you have to reset the device’s settings.  (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.or mouth.As you sleep, the airstream from the CPAP machine pushes against any blockages, opening your airways so your lungs receive plenty of oxygen.Without anything obstructing this flow of oxygen, your breathing doesn’t pause. As a result, you don’t repeatedly wake up in order to resume breathing.