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Its mirror is the hypnagogic state at sleep onset; though often conflated, the two states are not identical and have a different phenomenological character. Hypnopompic and hypnagogic hallucinations are frequently accompanied by sleep paralysis, which is a state wherein one is consciously aware of one's surroundings but unable to move or speak.
Hypnagogic hallucinations are often auditory or have an auditory component. Like the visuals, hypnagogic sounds vary in intensity from faint impressions to loud noises, like knocking and crashes and bangs (exploding head syndrome). People may imagine their own name called, crumpling bags, white noise, or a doorbell ringing.
Hypnagogic hallucinations can occur as one is falling asleep and hypnopompic hallucinations occur when one is waking up. Hallucinations can be associated with drug use (particularly deliriants), sleep deprivation, psychosis, neurological disorders, and delirium tremens. Many hallucinations happen also during sleep paralysis. [15]
Sleep-related hallucination may refer to: Hypnagogic hallucination – hallucinations while falling asleep; Dreaming – conscious experiences during sleep; Hypnopompic hallucination – hallucinations while waking up
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Sleep-related hallucinations are brief episodes of dream-like imagery that can be of any sensory modality, i.e., auditory, visual, or tactile. [2] They are differentiated between hypnagogic hallucination , that occur at sleep onset, and hypnapompic hallucinations , which occur at the transition of sleep to awakening. [ 2 ]
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 sensation.
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