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Related to Hypnagogic hallucination: narcolepsy, hypnopompic hallucination
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 ?
Hypnagogic hallucinations are vivid, sometimes realistic, dream imagery that occurs just as a person is going to sleep.
While CNS stimulant drugs are prescribed to control the EDS associated with narcolepsy, tricyclic antidepressant drugs are prescribed to control cataplexy, sleep paralysis and hypnagogic hallucinations.
Narcolepsy is a syndrome consisting of four symptoms: excessive sleepiness, hypnagogic hallucinations, sleep paralysis, and cataplexy.
sodium oxybate) to combat cataplexy, hypnagogic hallucinations, and sleep paralysis.
The classic tetrad of symptoms for narcolepsy includes excessive daytime sleepiness (EDS), cataplexy, sleep paralysis, and hypnagogic hallucinations (8).
While excessive daytime sleepiness generally persists throughout life, sleep paralysis and hypnagogic hallucinations may not.
Barnhill's patient swayed the author though the patient already has a psychotic illness (as well as many other possible contributors such as drug use), but even in sleep disorders hypnopompic or hypnagogic hallucinations are neither exclusive to narcolepsy, nor particularly pathognomonic.
Many of the classic symptoms of narcolepsy, such as excessive daytime sleepiness, cataplexy, sleep paralysis, and hypnagogic hallucinations, may be mistakenly associated with other disease states and must be differentiated from other sleep disorders.