Us Old People need our Sleep Too ! Not TOO Much Not TOO Little

  Researchers in Japan followed 1,517 adults without dementia for 10 years.
  Incident rates of dementia and all-cause mortality were significantly greater in subjects who slept less than 5 hours per day or 10 or more hours per day.
  Therefore, short AND long daily sleep duration are risk factors for dementia and death in adults age 60 and older.
J Am Geriatr Soc. 2018 June 6

Hardening of Arteries in Brain Increases Risk of MCI and Dementia

  Vascular risk factors are known to be associated with dementia. This study suggests atherosclerosis (hardening of the arteries) intracranially (in brain) is associated with mild cognitive impairment (MCI:Pre-dementia?) and dementia.
  Treating vascular risk factors may again decrease the development of atherosclerosis and decrease the prevalence of MCI and dementia.
Neurology 2017 Apr18;88:1556