<prompt> Hallucinations which occur at the start of sleep is :Hypnagogic hallucinationsHypnopompic hallucinationsJactatio nocturna capitisNon - specific hallucination  <response>: Hypnagogic hallucinationsThese occur while going to sleep. Jactatio capitis nocturna, or rhythmic movement disorder is a neurological disorder characterized by involuntary movements, usually of head and neck, before and during the sleep. 