Obstructive sleep apnoea (OSA) is characterised by repetitive collapse of the upper airway resulting in snoring, intermittent oxygen desaturations, sleep arousal, and excessive daytime sleepiness (Young et al. 1993). The severity of OSA is described by the apnoea hyponoea index (AHI). The community prevalence of at least moderate OSA (AHI >15) in reported to be approximately 15% in men and 5% in women (Peppard et al. 2013). The prevalence of OSA is rising, due to the increasing rates of obesity.