This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms and signs in psychiatry and classification, Subject name: Psychiatry
What is a hypnopompic hallucination 
Select and explain. 
A. If experienced while falling asleep, B. If experienced while awakening, C. After head trauma, D. After convulsion
B: If experienced while awakening
Answer: B: If experienced while awakening 
Explanation: Enquire whether the hallucinations occurred during wakefulness, or were they hypnagogic (occurring while going to sleep) and/or hypnopompic (occurring while getting up from sleep) hallucinations. this is a type of hallucination that presents in NARCOLEPSY , the major cause of narcolepsy is HYPOCRETIN DEFICIENCY a type of sleep disorder where there is hypnogogic hallucinations hypnopompic hallucinations sleep paralysis hypersomnia cataplexy( sudden loss of muscle tone due to emotional stimulus) Ref: a sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no.13