How are APOE and sleep related?

The relationship between APOE and sleep is an active research area, especially due to the link between APOE ε4 and Alzheimer's disease. Carriers of the ε4 allele often report more sleep disturbances, shorter sleep duration, and poorer sleep quality. Proposed mechanisms include disrupted circadian rhythms, impaired amyloid-beta clearance during sleep, and altered neurotransmitter systems. However, findings are inconsistent: some studies show no significant association, and effect sizes are modest. The provided context does not include specific studies on APOE and sleep, so this answer reflects general scientific knowledge. For personalized advice, clinical sleep assessments and genetic testing with counseling are recommended. Evidence grade: moderate (human data, but heterogeneous).