Association of sleep duration and napping with stroke mortality in older Chinese: A 14-year prospective cohort study of the Guangzhou Biobank Cohort study

•Short and long sleep duration were associated with higher risk of stroke mortality.•A U-shaped relationship was found with the nadir at sleep duration of 7 h/day.•The association was more pronounced in those with hypertension.•Non-significant association between napping and stroke mortality was found.