Our research shows that there is an association in the U.S. between Alzheimer's disease prevalence and exposure to light at night, particularly in those under the age of 65.
Nightly light pollution - a modifiable environmental factor - may influence risk for Alzheimer's.
This artificial illumination goes beyond just making it hard to see the night sky. Our bodies have evolved to function on a natural day-night cycle.
For people under 65, the association between nighttime light exposure and Alzheimer's prevalence was stronger than any other risk factor.
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