<![CDATA[Background: Cognitive decline is a common health problem in the elderly and can be influenced by various factors, including physical activity and sleep quality. Elderly people living in social care institutions have different environmental characteristics and activity patterns, so a study of factors related to cognitive function in this population is needed. Objective: This study aims to analyze the relationship between physical activity and sleep quality with cognitive function in elderly people living in social care institutions. Method: This study used a quantitative approach with a cross-sectional correlational design. The study was conducted from January to March 2026 at the UPTD Griya Wredha/Panti Sosial Lansia. A total of 102 elderly people were recruited using consecutive sampling techniques. Cognitive function was measured using the Mini-Mental State Examination (MMSE), sleep quality using the Pittsburgh Sleep Quality Index (PSQI), and independence in daily activities using the Barthel Index. Physical activity was assessed based on daily activity levels and classified into very light, light, moderate, and heavy. Univariate, bivariate, and multivariate analyses were conducted using multiple linear regression to identify the relationship between physical activity and sleep quality and MMSE scores after controlling for age, gender, education level, and physical independence. Results: The results of this study will be presented based on bivariate relationships and multiple linear regression models, including regression coefficients, 95% confidence intervals, p-values, and R². Conclusion: This study is expected to provide an overview of the contribution of physical activity and sleep quality to the cognitive function of elderly people in social care institutions and serve as a basis for developing promotive and preventive strategies to maintain cognitive function in the elderly population.]]>
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