Some people may also experience hypnagogic hallucinations during this stage.
2.
During NREM sleep the people can experience hypnagogic hallucinations, night terror, sleepwalking, and sleep-talking.
3.
The excessive daytime sleepiness generally persists throughout life, but sleep paralysis and hypnagogic hallucinations may not.
4.
Hypnagogic hallucinations and drug use ( particularly deliriants ), sleep deprivation, psychosis, neurological disorders, and delirium tremens.
5.
Humanoid and animal figures, often shadowy or blurry, are often present in hypnagogic hallucinations, more so than other hallucinogenic states.
6.
There are wide variations in the development, severity, and order of appearance of cataplexy, sleep paralysis, and hypnagogic hallucinations in individuals.
7.
The combination of sleep paralysis and hypnagogic hallucination could easily cause someone to believe that a " demon was holding them down ".
8.
According to research in anomalistic psychology visions of ghosts may arise from hypnagogic hallucinations ( " waking dreams " experienced in the transitional states to and from sleep ).
9.
The characteristic fragmentation of REM sleep, hypnopompic, and hypnagogic hallucinations have a heritable component in other parasomnias, which lends credence to the idea that sleep paralysis is also genetic.
10.
Herbert Silberer described a process he called " autosymbolism ", whereby hypnagogic hallucinations seem to represent, without image, which may be perceived as an apt and succinct representation thereof.
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