Leng Y, et al. – Via assessing a cohort of 2,751 community-dwelling older men, researchers explored the longitudinal connection between napping and cognitive impairment. Wrist actigraphy was used to measure naps in older men. Cognition was evaluated repeatedly over 12 years, and clinically significant cognitive impairment was determined by practitioner diagnosis, Alzheimer's medication use, or a significant cognitive decline. Men with longer napping durations had greater cognitive decline and a higher risk of cognitive impairment after adjustment for all covariates. Investigators found that men who napped for ≥ 120 min/day were 66% more likely to develop cognitive impairment in 12 years. The findings were not significantly altered by further adjustment for nighttime sleep quality. Among those with higher sleep efficiency and average sleep duration, the link between napping and cognitive impairment was more pronounced. As an early marker of cognitive impairment in the elderly, napping may be helpful, and its cognitive impacts may vary from nighttime sleep.