To evaluate sleep quality and its relationship with orofacial dysfunction in children aged 6 to 14 years. A crosssectional observational study was carried out in a sample of 47 children and adolescents between 6 and 14 years of age who attended the Disciplines of Children's Clinic and Oral Health Promotion Clinic from June to August 2016 at the University Tuiuti of Paraná. To evaluate the orofacial function, the Nordic Orofacial Test-Screening-NOT-S was used and the Pittsburgh sleep quality questionnaire was used for sleep evaluation. The analysis of the questionnaires showed that 55% of the children had good sleep quality, 38% had poor sleep quality, and 7% presented sleep disorders. Relating sleep to orofacial dysfunction measured through NOT-S, the results showed that the score ranged from 1 to 6 with a mean of 4.0 (±1.23). This revealed an average of 4 domains of orofacial function compromised. It is observed as domain more frequently involved the domain face at rest followed by habits. The relationship between sleep quality and orofacial dysfunction revealed, for this sample, that children with poor sleep quality presented greater orofacial impairment.