Obstructive sleep apnoea is a severe disorder in which breathing repeatedly stops for 10 seconds or more during sleep. The disease results in decreased oxygen in the blood. The most common cause of obstructive sleep apnoea is obesity. Untreated obstructive sleep apnoea can lead to severe complications, including cardiovascular disease and premature death. Additionally, obstructive sleep apnoea is associated with excessive daytime sleepiness, which increases the risk of motor vehicle accidents and depression.