<![CDATA[This study aims to examine the relationship between sleep quality and the performance of male swimming athletes. This study involved 25 swimming athletes from Anugrah Swimming Club as research participants. A purposive sampling technique was applied, with inclusion criteria comprising. The variables in this study consisted of an independent variable (sleep quality) and a dependent variable (performance). Data collection was conducted to obtain empirical data for testing the research hypothesis. The data collected included sleep quality data obtained through the Pittsburgh Sleep Quality Index (PSQI) questionnaire, which was administered to participants to assess subjective sleep quality. Performance of swimming athletes was measured using the Beep Test. Data were analyzed descriptively and correlationally using Simple Linear Regression analysis and with the assistance of SPSS version 25 to examine the relationship between sleep quality and swimming performance. The result of this study is the significance value (Sig.) is 0.001, which is less than the probability level of 0.05. Therefore, it can be concluded that there is a significant effect of sleep quality on male swimming athletes’ performance. The calculated t-value is −3.906. Since the absolute value of t-count (3.906) is greater than the t-table value (1.708), it can be concluded that sleep quality has a significant effect on the performance of male swimming athletes. In conclusion, sleep quality is a critical factor in supporting swimming performance. Adequate and high-quality sleep contributes not only to physical recovery but also to improved cognitive function and psychological readiness.]]>
