Researchers monitored 733 women aged 80 and above over five years, finding that those who developed increased daytime sleepiness faced double the risk of dementia.

For seniors, such sleepiness could indicate that they’re at increased risk for dementia, a new study suggests. Women in their 80s had double risk of dementia if they experienced increasing daytime sleepiness over a five-year period, researchers reported in the journal Neurology.

A new study, which explored the link between sleep and dementia risk, found that women over the age of 80 who had increasing sleepiness during the day showed a higher risk for dementia, according to authors of a study published Wednesday in Neurology.