Mutations in the Acetylserotonin O-Methyltransferas (ASMT), Melatonin Receptor 1A (MTNR1A), and Melatonin Receptor 1B (MTNR1B) genes can induce sleep disorders in ASD patients by affecting melatonin production and utilization (90–92). Here, MTNR1B is linked to sleep disorder.