What is a hypnopompic hallucination

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