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During the sacred period known as Ramadan in the Islamic faith, abstaining from food and drink is observed from dawn until dusk. This fasting practice can lead to alterations in the circadian rhythm due to sudden shifts in dietary habits and sleep patterns. Given that changes in circadian rhythm can impact sleep patterns, a relational survey model was implemented in this investigation. Data collection involved the utilization of the Pittsburgh Sleep Quality Index (PSQI) alongside a sociodemographic survey. A total of seventy-three athletes willingly participated in the study. Statistical analysis was conducted using SPSS 25.0, employing the Mann-Whitney U test for variables with two parameters and the Kruskall-Wallis H test was for those with three or more parameters. The significance level was established at p ≤ 0.05. Upon comparing the PSQI and its sub-dimensions, a statistically significant difference was observed in relation to age, alterations in mealtimes, changes in appetite, duration of sleep, and time required to fall asleep. Consequently, the data gathered in our study indicates that modifications in eating and sleeping schedules during Ramadan can disrupt the sleep quality of athletes.