An Early Warning Sign of Alzheimer's May Be Keeping Some Women Up at Night

In 69 women aged 65 and older, poorer sleep was linked to worse visual memory and more tau buildup.

The association appeared only in the highest genetic-risk group for Alzheimer’s.

When women with pre-existing sleep disorders were excluded, the link no longer held.

The cross-sectional study suggests sleep could be an early warning sign—and a possible prevention target—for some high-risk women.