Introduction. Adaptation of younger schoolchildren to the educational process affects not only their health, but also their academic performance. Sleep plays a vital role in children's cognitive and neurodevelopment, hence adequate sleep is essential to improve academic performance. The article presents data on the influence of the structure of sleep habits on the academic performance of primary schoolchildren. Purpose of the investigation. Determining the prevalence of sleep disorders and its impact on the academic performance of schoolchildren aged 6–12 years. Materials and methods. The study included 350 children aged 6 to 12 years from schools in the city of Norilsk, Krasnoyarsk Territory. The article uses polling methods (CSHQ scale, adapted into Russian) and descriptive statistics; analytical method. Results and discussion. The results obtained are generally comparable with the data of many previous studies. When analyzing the CSHQ questionnaire, it was found that 71,9% of the examined children had significant statistical deviations of clinical significance, which indicates a significant prevalence of altered sleep habits. A one-unit increase in CSHQ total score was associated with a 0,38% decrease in academic performance. Other risk factors noted included nocturnal enuresis (3,5%), snoring (10,6%), paroniria (8%) and teeth grinding (6,4%). A higher correlation of children's poor performance in school with poor or inadequate sleep quality has been mathematically proven, compared with the child's low academic abilities (β = -0,42; p