Both too much and too little sleep may have negative effects.

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Increased daytime sleepiness could raise the risk of dementia among ...

Increasing sleepiness over 5 years doubled dementia risk among cognitively unimpaired women in their 80s. Sleep efficiency, wake after sleep onset, and nap duration and frequency were individually ...

Multiple large-scale studies tracking adults from midlife into old age have converged on a consistent finding: people who ...

Older women experiencing increased daytime sleepiness may need to pay attention to more than just feeling tired. Revolutionary research from the University of California, San Francisco has uncovered a ...

A machine-learning analysis of brain waves recorded during sleep may help identify people at high risk of developing dementia, according to a study led by UC San Francisco and Beth Israel Deaconess ...

A machine-learning analysis of brain waves recorded during sleep may help identify people at high risk of developing dementia, according to a study led by UC San Francisco and Beth Israel Deaconess ...

Increasing 24-hour sleepiness in women in their 80s was associated with a doubling in risk for dementia compared with their peers with stable sleep patterns, a new study showed. Researchers analyzed ...

Women in their 80s who experience increasing sleepiness over time have double the risk of developing dementia than their counterparts with stable sleep patterns, a recent analysis suggests. Published ...

Our date of birth doesn't always match the age of our brain. How old our brain really is depends on our biological age, shaped by the wear and tear our cells experience over time. Genetics, ...

Scientists have discovered that poor sleep can limit the brain's ability to clear toxins, raising the risk of dementia. A study — published in Alzheimer's & Dementia: The Journal of the Alzheimer's ...

Please provide your email address to receive an email when new articles are posted on . Older women with increasing daytime sleepiness had roughly double the risk for dementia vs. those with stable ...