Ohara T, et al. - In a prospective cohort study, researchers determined if daily sleep duration is associated with the risk of dementia and death. The link was investigated in community-dwelling Japanese adults aged 60 and older without dementia via Cox proportional hazards models. They found that those with a daily sleep duration of less than 5 hours and 10 hours or more showed significantly greater age- and sex-adjusted incidence rates of dementia and all-cause mortality vs those with daily sleep duration of 5 to 6.9 hours. Overall, short and long daily sleep duration and use of hypnotics were identified as risk factors for dementia and death in this study population.