Associations of accelerometer-based sleep duration and self-reported sleep difficulties with cognitive function in late mid-life: The Finnish Retirement and Aging Study

With the population aging, prevalence of cognitive deficits is increasing. To suppress this increase it is crucial to detect underlying risk factors behind cognitive deficits and enable primary prevention early enough in the life-course. Previous studies have suggested that sleep duration and sleep difficulties are associated with cognition in old age, but little is known of this association in the late mid-life. The aim of this study is to examine the associations of accelerometer-based sleep duration and self-reported sleep difficulties with different domains of cognition among aging workers. The study population (N=289) consists of participants of the Finnish Retirement and Aging Study (FIREA). Sleep duration was measured with wrist-worn accelerometers, and the participants were divided into short (