Intersections among EMA and smartwatch‐derived daily sleep, physical activity, stress, mood, and subjective cognition in older adults without dementia

Inconsistent sleep patterns, greater daily stress, less physical activity, and more variable mood were related to increased day-to-day fluctuations in subjective daily cognition. There was concordance of EMA vs. smartwatch derived metrics for physical activity and sleep. Only EMA and not smartwatch measures of IIV sleep duration and average physical activity were related to fluctuations in subjective cognition. Overall, these findings emphasize the importance of regularity in daily mood and sleep as well as increasing daily exercise as modifiable risk factors for cognitive decline.