Spinocerebellar Ataxia-6 Associated with Sleep Behavior Disorder.

Spinocerebellar ataxia (SCA)-1, 2, 3, 6, and 31 are associated with sleep behavior disorder. We had a 66-year-old male who presented with late-onset cerebellar ataxia. Before 2 years, the onset of cerebellar symptoms, he had a history of sleep behavior disorder. He had a strong family history of similar symptoms in his younger sister. Whole exome sequencing of the patient and Sanger sequencing of his sister confirmed the diagnosis of SCA-6.