This is a machine that blows pressurised air into the nose and or mouth through a mask which is worn strapped to the face. This holds the soft parts of the airway apart and stops the vibration that causes the snoring noise. It is also a very effective treatment for sleep apnoea and this is usually why it is recommended. The downside of the treatment is that it has to be used every night to be effective. For people with severe symptoms, the treatment makes them feel so much better that they are prepared to put up with the inconvenience. In some patients with a blocked nose, using the CPAP is very uncomfortable due to dryness of the mouth. They may need surgery on the nose to make it easier to use the machine.