Editing Sleep paralysis (section)

===Hallucinations===
[[File:Fritz Schwimbeck - My Dream, My Bad Dream. 1915.jpg|thumb|upright=1.3|A picture of a [[succubus]]-like vision. ''My Dream, My Bad Dream'', 1915, by Fritz Schwimbeck]]

Several types of hallucinations have been linked to sleep paralysis: the belief that there is an intruder in the room, the feeling of a presence, and the sensation of floating. One common hallucination is the presence of an [[incubus]]. A neurological hypothesis is that in sleep paralysis the [[cerebellum]], which usually coordinates body movement and provides information on body position, experiences a brief myoclonic spike in brain activity inducing a [[floating (psychological phenomenon)|floating]] sensation.<ref name=Cheynetwothree />

The [[trespasser|intruder]] and incubus hallucinations highly correlate with one another, and moderately correlated with the third hallucination, vestibular-motor disorientation, also known as [[out-of-body experience]]s,<ref name=Cheynetwothree /> which differ from the other two in not involving the threat-activated vigilance system.<ref name=FISP />