These can include intruder hallucinations, where the individual perceives a dangerous person or presence in the room; chest pressure hallucinations (also known as incubus hallucinations), which involve feelings of suffocation and often occur alongside intruder hallucinations; and vestibular-motor (V-M) hallucinations, which involve feelings of movement or out-of-body sensations.
Recurrent sleep paralysis, or multiple sleep paralysis episodes over time that are usually associated with narcolepsy.
Sleep paralysis, on the other hand, seems to occur when the atonia and mental imagery of REM sleep persists even into a state of being aware and awake.
Isolated sleep paralysis, or one-off paralysis episodes that are not connected to an underlying diagnosis of narcolepsy (a neurological disorder that disrupts the ability of the brain to properly control wakefulness).
The Sleep Foundation describes sleep paralysis as a "temporary inability to move or speak that occurs directly after falling asleep or waking up".
