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Insomnia and narcolepsy are the most common disorders, but at the extreme end of the scale is sleep paralysis, or night terror.
It is an in-depth treatment of the experience of sleep paralysis based on interviews conducted in Newfoundland about the "Old Hag," the local name for this experience, and a scientific discussion of sleep paralysis.
The cardinal symptoms include paroxysmal sleep (100%), cataplexy (70%), hypnagogic hallucination (25%), and sleep paralysis (5%).
The above theory is consistent with Cheyne, Rueffer, and Newby-Clark's (1999) observations that during the hypnagogic pre-sleep state it is common to experience a number of kinesthetic hallucinations such as a sense of floating, body dissociation, and other tactile aberrations in addition to sleep paralysis.
Injury to the hypothalamus from tumor, surgery, or other cause can induce problems with REM sleep: sleep paralysis, hypnagogic hallucination, sleep onset REM period, and muscle atonia.
Like sleep paralysis, they are common in people with narcolepsy but can also occur in those with no identified sleep disorder.
Sleep paralysis is defined as 'a discrete period of time during which voluntary muscle movement is inhibited, yet ocular and respiratory movements are intact," the report said.
Sleep paralysis may be accompanied by visual, auditory or tactile hallucinations.
Narcolepsy is less common, "but can create serious problems, such as excessive sleepiness, sudden muscular weakness, becoming sleepy when excited or angry, and sleep paralysis," explains Sullivan.
Two boys, 15 and 17 years old, complained of uncontrollable excessive daytime sleepiness (EDS), frequent cataplexy triggered by laughter, hypnagogic hallucinations and sleep paralysis for the past 5 years.
The classic tetrad of symptoms for narcolepsy includes excessive daytime sleepiness (EDS), cataplexy, sleep paralysis, and hypnagogic hallucinations (8).
Many suffer from adisorder known as sleep paralysis but often mistake the experience to be asupernatural encounter