Sleep complaints and genetic risk of Alzheimer’s disease in older women: associations with memory and tau deposition

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