People who have insomnia may be at much higher risk of developing dementia than people who have no trouble sleeping, a new study suggests.

People who had trouble sleeping at least three nights a week for three or more months were at 40% increased risk of developing mild cognitive impairment or dementia than people without insomnia, the study found. The increased risk equaled about 3 1/2 years of additional aging, according to the researchers. MORE: U.S. death rate falls to lowest level since the COVID-19 pandemic, CDC report says

"Insomnia doesn't just affect how you feel the next day — it may also impact your brain health over time," the study's author, Dr. Diego Carvalho, of the Mayo Clinic, said in a news release . "We saw faster decline in thinking skills and changes in the br

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