This study aims to investigate whether children with Duchenne muscular dystrophy (DMD) have sleep disorders in addition to evaluate the sleep quality and daytime sleepiness in mothers who are primary caregivers using questionnaires. Demographic and clinical data in addition to gross motor functional status of 24 patients with a DMD diagnosis were measured using gross motor function classification system (GMFCS). The patients were given the sleep disturbance scale for children (SDSC) in order to evaluate their sleep features. Additionally, 24 mothers were given Pittsburgh sleep quality index (PSQI) in order to measure sleep quality and Epworth sleepiness scale (ESS) in order to measure daytime sleepiness. Sleep disturbances were observed in 62.5% (n=15) of the patients according to SDSC, in 41.6% (n=5) who were GMFCS I, II, III and in 83.3% (n=10) who were IV-V. According to PSQI scores, 54.2% of the mothers of children with DMD had low sleep quality. Ten (41.6%) mothers had increased daytime sleepiness according to ESS. Eight (80%) of the mothers with increased daytime sleepiness were IV or V according to GMFCS and all of these mothers suffered from low sleep quality based on PSQI. Evaluation of sleep quality in patients with DMD is important given that the incidence sleep disturbances increase parallel to the loss of gross motor functions. The loss in gross motor also has a negative impact on the sleep quality of the caregiver. This study shows that the evaluation of sleep in both patients and their caregivers should be a piece of clinical practice beginning from the diagnosis of the disease.