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Hallucination
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===Hypnagogic hallucination=== {{Main|Hypnagogia}} These hallucinations occur just before falling asleep and affect a high proportion of the population: in one survey 37% of the respondents experienced them twice a week.<ref name=Ohayon>{{cite journal | vauthors = Ohayon MM, Priest RG, Caulet M, Guilleminault C | title = Hypnagogic and hypnopompic hallucinations: pathological phenomena? | journal = The British Journal of Psychiatry | volume = 169 | issue = 4 | pages = 459β467 | date = October 1996 | pmid = 8894197 | doi = 10.1192/bjp.169.4.459 | s2cid = 3086394 }}</ref> The hallucinations can last from seconds to minutes; all the while, the subject usually remains aware of the true nature of the images. These may be associated with [[narcolepsy]]. Hypnagogic hallucinations are sometimes associated with brainstem abnormalities, but this is rare.<ref name=manford>{{cite journal | vauthors = Manford M, Andermann F | title = Complex visual hallucinations. Clinical and neurobiological insights | journal = Brain | volume = 121 ( Pt 10) | issue = 10 | pages = 1819β1840 | date = October 1998 | pmid = 9798740 | doi = 10.1093/brain/121.10.1819 | doi-access = free }}</ref>
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