Poor sleep linked to Alzheimer’s risk in older women – study

Poor sleep may signal higher Alzheimer’s risk in older women with greater genetic risk, a study suggests.

Older women who reported poorer sleep also showed greater memory difficulties and more Alzheimer’s-related brain changes, the study found.

That pattern appeared only in women with higher genetic risk, suggesting sleep complaints may be a stronger warning sign for some women than for others.

Researchers examined 69 women aged 65 years and older taking part in the Women Inflammation Tau Study, an ongoing project focused on ageing and Alzheimer’s disease risk.

Participants completed questionnaires about their sleep quality, underwent memory testing and received brain scans measuring tau. Tau is a protein that accumulates abnormally in Alzheimer’s disease.

The study found that poorer self-reported sleep was associated with worse visual memory performance and greater tau accumulation in brain regions affected early in Alzheimer’s disease, but only among women with higher genetic risk.

Women with lower genetic risk did not show the same relationship between sleep complaints, memory and tau build-up. The finding was specific to visual memory and was not observed for verbal memory.

Researchers said the results add to growing evidence that sleep disturbances and Alzheimer’s disease may reinforce one another over time.

Previous studies have suggested that disrupted sleep can contribute to the build-up of abnormal tau proteins, while Alzheimer’s-related brain changes may also interfere with healthy sleep patterns.

Because women account for nearly two thirds of Alzheimer’s cases and frequently report poorer sleep quality than men, the researchers said sleep may represent an important and potentially modifiable risk factor in older women.

The authors noted that self-reported sleep assessments are inexpensive and easy to administer, raising the possibility that sleep complaints could help identify people who may benefit from closer monitoring or early intervention.

They also suggested that improving sleep could become a target for future Alzheimer’s prevention strategies, particularly for women at elevated genetic risk.