One Stage of Sleep Seems to Be Critical in Reducing Dementia Risk ScienceAlertSleepiness During the Day Could Be Early Sign of Dementia, Study Finds NewsweekExcessive daytime sleepiness can lead to dementia, study indicates MSNPoor sleep can age your brain by 3 years; study reveals alarming link between sleep problems and brain age Hindustan TimesFind yourself canceling mid-week plans more?