Summary: A new study reveals that self-reported sleep complaints are a critical risk factor for Alzheimer’s disease in older women who carry a higher genetic predisposition. Tracking participants from the Women Inflammation Tau Study, researchers discovered that poor sleep quality directly correlates with accelerated tau protein accumulation and visual memory decline, but exclusively among women at elevated genetic risk.
Because women account for nearly two-thirds of all Alzheimer’s cases and frequently report poorer sleep than men, monitoring sleep quality offers an inexpensive, non-invasive avenue for early clinical intervention.
Key Facts
- The Genetic Dependency: The destructive relationship between poor sleep, memory loss, and protein aggregation was observed only in women with a high genetic risk for Alzheimer’s. Women with lower genetic risk showed no such link.
- Targeted Cognitive Decline: Poorer sleep was explicitly tied to worse visual memory performance, whereas verbal memory skills remained unaffected.
- The Bidirectional Feedback Loop: The findings reinforce a problematic feedback loop where disrupted sleep accelerates the abnormal accumulation of tau proteins, while the resulting brain damage further degrades healthy sleep architecture.
- Modifiable Risk Factor: Since sleep quality can be clinically or behaviorally improved, it represents a vital, modifiable target for future preventative strategies in vulnerable patient demographics.
Source: UCSD
Sleep complaints may be an important Alzheimer’s disease risk factor in older women with a higher genetic predisposition to the disease, according to a new study from researchers at the University of California San Diego.
The findings suggest that women with a higher genetic risk for Alzheimer’s who reported poorer sleep also showed greater memory difficulties and more Alzheimer’s-related brain changes.
Researchers examined 69 women aged 65 years and older participating in the Women Inflammation Tau Study, an ongoing project focused on aging and Alzheimer’s disease risk. Participants completed questionnaires about their sleep quality, underwent memory testing and received brain scans that measured tau, 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 buildup. The finding was specific to visual memory and was not observed for verbal memory.
Researchers say 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 buildup 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 say sleep may represent an important and potentially modifiable risk factor in older women.
The authors note 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 suggest that improving sleep could become a target for future Alzheimer’s prevention strategies, particularly for women at elevated genetic risk. Overall, it might be important to take sleep complaints seriously for older women as it may be relevant to their brain health.
Key Questions Answered:
A: It comes down to a genetic intersection. This study shows that poor sleep doesn’t automatically cause Alzheimer’s changes on its own. Instead, it acts as a dangerous catalyst that unlocks pathology specifically in women who already have an underlying genetic vulnerability to the disease.
A: Tau is a protein that abnormally clumps into tangles inside the brain during Alzheimer’s, choking off vital neural pathways. Science suggests a bidirectional feedback loop: deep sleep acts as a washing cycle to clear metabolic waste from the brain, so disrupted sleep allows tau to rapidly build up. As tau damages sleep-regulating brain regions, sleep quality drops even further.
A: Women bear a disproportionate burden of this disease, accounting for nearly two-thirds of all diagnosed Alzheimer’s cases. Additionally, older women statistically report much poorer sleep quality than men. Because sleep is something we can actively treat and improve, it represents one of our best windows for early prevention in women.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this Alzheimer’s disease and sleep research news
Author: Lizelda Lopez
Source: UCSD
Contact: Lizelda Lopez – UCSD
Image: The image is credited to Neuroscience News
Original Research: Open access.
“Sleep complaints and genetic risk of Alzheimer’s disease in older women: associations with memory and tau deposition” by Kitty K. Lui, Xin Wang, Melanie A. Dratva, Ella T. Lifset, Jordan Stiver, Nadine C. Heyworth, Qian Shen, Michael Thomas, Pamela N. DeYoung, Atul Malhotra, Erin E. Sundermann, and Sarah J. Banksl. Journal of Prevention of Alzheimer’s Disease
DOI:10.1016/j.tjpad.2026.100581
Abstract
Background
Emerging evidence point to a bidirectional relationship between sleep disturbances and Alzheimer’s disease (AD). Poor sleep may be an overlooked risk factor for older women, who are disproportionately affected by AD and report worse subjective sleep quality than men. High genetic AD risk—characterized by the polygenic hazard score (PHS), including apolipoprotein (APOE) ε4 carriership—may further compound the effects of disrupted sleep on AD, particularly for older women.
Objective
This study examined the moderating effect of genetic AD risk on subjective sleep as it related to memory and tau burden in a sample of older women.
Participants
The sample consisted of older women (≥65 years old) from the Women Inflammation Tau Study.
Measurement
Participants completed the Pittsburgh Sleep Quality Index (PSQI), Rey Auditory Learning Test, and Brief Visuospatial Memory Test-Revised. They also underwent [18]F-MK6240 positron emission tomography. Tau burden was calculated in composite regions across Braak stages. Genetic risk groups were characterized by PHS stratified at the 75th percentile. PSQI global score × PHS group interactions on memory composite scores (N = 69) and tau burden (N = 63) were examined.
Results
PSQI global score × PHS group interactions were observed on visual memory and pathological tau in Braak regions III/IV (ps<0.10). Poorer subjective sleep was associated with worse visual memory and greater limbic tau deposition only among higher genetic risk women (ps<0.04). No significant associations were observed for verbal memory or tau in Braak regions I/II or V/VI.
Conclusion
Older women with elevated genetic AD risk and subjective sleep difficulties may be at greater risk for visual memory deficits and tau burden in regions affected in early AD. This suggests that sleep complaints may represent a promising AD risk factor. Improving sleep may be a potential intervention target for AD mitigation and prevention, particularly for older women.
