Where apnoea is very frequent or associated with severe drops in oxygen levels then the most effective treatment practical, such as CPAP is routine. In mild or moderate sleep apnoea CPAP is used where people have annoying symptoms particularly excessive sleepiness. Mild to moderate apnoea without sleepiness would usually be offered a combination of weight loss with posture modification and possibly also a mandibular advancement splint. ENT surgery may have a role, but often it is not adequate as sole treatment. Uvulopalatopharyngoplasty "uppp" will reduce snoring in 80%, but only one in six will have a meaningful reduction in apnoea frequency.