AIM: The aim of the research was to establish sleep disturbances in patients suffering from focal dystonia and to examine the impact of sleep disturbances on the quality of life in patients with focal dystonia. PARTICIPANTS AND METHODS: The study was conducted on 60 participants. The participants were patients with symptoms of focal dystonia, who came for a check-up to the Department of Neurology at Medical Centre Osijek, and a healthy control group, matching age and gender. The following scales were used in the research: Pittsburgh Sleep Quality Index (PSQI), Short Form Health Survey for questioning the subjective feeling of health (SF-36) and Epworth Sleepiness Scale (ESS). A special questionnaire was created for the purposes of this research considering demographic data. RESULTS: We haven't observed statistically significant differences between groups considering age, gender, habits, life circumstances and comorbidity. Patients suffering from focal dystonia need more time to fall asleep. They wake up more often, have bad dreams and experience pain as well as use hypnotics more often in relation to control group (P = 0,002). We haven't found any statistically significant differences while questioning daytime sleepiness among groups. According to the questionnaire about the quality of life, participants suffering from focal dystonia and poor sleep quality have statistically noticeably more disturbances in restriction segments due to physical health (P=0,01) and physical pain (P=0,02). CONCLUSION: Participants suffering from focal dystonia more often have poorer sleep quality while daytime sleepiness is not emphasised more in comparison to the healthy control group. Poorer sleep quality in these participants affects negatively the quality of life, primarily because of restricting activities due to physical health and pain.