Daytime sleepiness is the most common complaint of patients with OSAHS. At first glance, there are two mechanisms by which OSAHS may produce sleepiness. Breathing disturbances are accompanied by sleep arousals resulting in sleep fragmentation; and hypoxaemia occurs during apnoeic events and might result in repetitive brain oxygen desaturations. The importance of these mechanisms, their link with sleepiness and the impact of CPAP treatment need to be clarified.
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