This study focused on examining the quantity and quality of sleep among 51 young football players aged 15, 16, and 17 from NK Istra 1961. The first goal of the research was to determine whether there is a significant difference in sleep quality and quantity between the U16, U17, and U18 categories. The second goal was to see if the respondents' sleep quantity values were within the recommended sleep amount. Data were collected using an application, and the respondents self-reported their sleep quantity and subjectively assessed their sleep quality over a period of 113 days. The results showed that all respondents, with an average sleep quantity (Hav=8.33), fell within the recommended sleep amount. Furthermore, an analysis of variance revealed a statistically significant difference between groups. The U16 group had a significantly higher amount of sleep hours compared to the U17 and U18 groups. The reason for this could be the pubertal period, as they are most influenced by pubertal growth and development. This study indicates that young people of this age in the Istria region, specifically from the NK Istra 1961 football club, have a normal amount and quality of sleep (Q=4.46). These data represent a baseline state of athletes' sleep and are favorable for further research with other variables such as motor and functional abilities.