Poor sleep is a hallmark of Alzheimer's disease says a study at Washington University School of Medicine. Researchers may have discovered for why poor sleep is linked to Alzheimer's disease which is the most common cause of dementia among the elderly. According to researchers older people who have less slow-wave sleep the deep sleep you need to consolidate memories and wake up feeling refreshed have higher levels of the brain protein tau. Elevated tau is a sign of Alzheimer's disease and has been linked to brain damage and cognitive decline they say. In light of the findings of this study we can
