Intellectual Developmental Disorder, Autosomal Recessive 37, is also known as mental retardation, autosomal recessive 37, and has symptoms including muscle spasticity and sleep disturbances. An important gene associated with Intellectual Developmental Disorder, Autosomal Recessive 37 is ANK3 (Ankyrin 3). Affiliated tissues include brain, and related phenotypes are spasticity and hypotonia