This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of Psychiatry, Subject name: Psychiatry
Hallucination which occur at sta of sleep are known as ? 
Select and explain. 
A. Hypnogogic hallucination, B. Hypnopompic hallucination, C. Jactatio capitis nocturna, D. Reflex hallucinations
A: Hypnogogic hallucination
Answer: A: Hypnogogic hallucination 
Explanation: Hypnogogic hallucination - occur while going to sleep. Hypnopompic hallucinations - occur while getting up from sleep Jactatio capitis nocturna or rhythmic movement disorder is a neurological disorder characterized by involuntary movements, usually of head and neck, before and during sleep. In reflex hallucinations, stimulus in one modality results in development of hallucination in another modality