Study expands the science on the link between sleep and dementia CNNOne Stage of Sleep Seems to Be Critical in Reducing Dementia Risk ScienceAlertHow Daytime Drowsiness Could Signal Early Cognitive Decline SciTechDailyExcessive daytime sleepiness can lead to dementia, study indicates MSNSleepiness During the Day Could Be Early Sign of Dementia, Study Finds Newsweek