Obstructivesleepapnoea(OSA)isacommonconditioncharacterizedbyrepetitiveepisodesofpartialorcompleteupperairwayobstructionduringsleep(Figure1).Obstructiveeventsareusuallyassociatedwithhypoxia,whichcanbeprofound,andterminatedbyanarousalfromsleep,producingsympatheticnervoussystemactivationandsleepfragmentationwith