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5%, 44.7%, and 58.3% of patients with Expanded Disability Status Scale scores of 0-3, 3-6, and 6, respectively. Our results indicate that sleep disorders are more common in patients with MS than in other populations. Patients with secondary progressive forms of MS more frequently present sleep disturbances, while patients with primary progressive forms report them less frequently. Age and degree of disability were positively correlated with the prevalence and severity of sleep disorders in MS patients. Our results indicate that sleep disorders are more