This study aimed to examine the associations of both subjectively and objectively measured sleep with self-reported level of physical activity among older adults, and explore the possible moderative role of chronotype in these associations. Baseline data of 116 community-dwelling older adults without dementia from three prior studies were included. Pittsburgh Sleep Quality Index and Actigraphy were used as subjective and objective sleep measures respectively. The Morningness-Eveningness

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... naire was used to measure chronotype, which was further dichotomized into morning type and non-morning type. Physical activity was assessed by the Physical Activity Scale for Elderly. Multiple linear regressions were performed to examine the associations, controlling for demographic and health characteristics. We found better subjective sleep quality, shorter actigraphy sleep duration, and higher sleep efficiency were independently associated with greater physical activity. Being morning type might alleviate the association between poor subjective sleep quality and physical activity among older adults.