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Related to hypnopompic hallucination: Hypnagogic hallucinations
See: figment, insanity, phantom

HALLUCINATION, med. jur. It is a species of mania, by which "an idea reproduced by the memory is associated and embodied by the imagination." This state of mind is sometimes called delusion or waking dreams.
     2. An attempt has been made to distinguish hallucinations from illusions; the former are said to be dependent on the state of the intellectual organs and, the latter, on that of those of sense. Ray, Med. Jur. Sec. 99; 1 Beck, med. Jur. 538, note. An instance is given of a temporary hallucination in the celebrated Ben Johnson, the poet. He told a friend of his that he had spent many a night in looking at his great toe, about which he had seen Turks and Tartars, Romans and Carthagenians, fight, in his imagination. 1 Coll. on Lun. 34. If, instead of being temporary, this affection of his mind had been permanent, he would doubtless have been considered insane. See, on the subject of spectral illusions, Hibbert, Alderson and Farrar's Essays; Scott on Demonology, &c.; Bostock's Physiology, vol. 3, p. 91, 161; 1 Esquirol, Maladies Mentales, 159.

References in periodicals archive ?
Non-narcoleptics with hypnagogic or hypnopompic hallucinations might benefit from sleep hygiene, where as the sleep hygiene for narcoleptics is more complicated and involves (among other things) scheduled naps.
I am aware of the nonspecificity of hypnagogic and hypnopompic hallucinations, but in this patient there is a subset of sensory experiences that arise with awakening from sleep that differ qualitatively from those associated with his psychotic episodes.
Hypnagogic and hypnopompic hallucinations C dreamlike, often terrifying auditory, visual or tactile hallucinations while falling asleep or waking up.