INTRODUCTION
cognitive decline, SWS, AD dementia, dementia
OBSTRUCTIVE SLEEP APNEA
Sleep disturbances are a frequent complaint in older adults, affecting more than a half of older individuals [A number of studies have investigated the impact of sleep changes on cognitive performance and dementia risk, providing inconsistent findings. Different methodological approaches have been used, ranging from large epidemiological studies using self-reports of sleep quality, to more specific experimental designs using polysomnography. Various aspects of sleep including poor self-reported sleep quality, short sleep duration and sleep fragmentation have been quite consistently associated with an increased risk of cognitive decline and AD dementia (see [SWS is markedly affected by the aging process. SWS-related parameters, including reduced Slow Wave Activity (SWA; corresponding to the spectral power of slow waves), have been associated with poorer executive functioning [Above methodological differences in terms of age range, sample sizes and the type of sleep measures used (subjective vs objective), the heterogeneity of previous results could be explained by different capacities of older individuals to tolerate the effects of sleep disruption. Indeed, older adults appear to better tolerate the effects of sleep deprivation than their younger counterparts [The potential impact of CR in the context of sleep disturbances has hardly been explored. In a study conducted in patients with obstructive sleep apnea, in which CR was assessed using IQ, Alchanatis et al. [Given that SWS is markedly reduced in aging [