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Perceptual disorders hallucinations auditory hallucination hypnagogic hallucination visual hallucination causes of hallucinations diagnosis of hallucination treatments for hallucinations

What is hypnagogic hallucination?

Hypnagogic hallucination is episodes of seeing and hearing things as one is falling asleep. These dreams can be frightening and can often cause a sudden jerk and arousal just before sleep onset. For example, you may see yourself falling and awaken with a sudden jerk, just before impact. As the subject drifts off to sleep, he/she moves into a state that

combines the environment, of which the subject is still partially aware, with a dream-like state of sleep, in which he might see people and hear them talking. The experiences are often frightening. Sleep deprivation, irregular sleep schedules, and medications all can predispose to occurrences of this phenomenon.

Hypnagogic hallucinations can occur at sleep onset, either during daytime sleep episodes or at night. They are usually quite vivid, and often involve vision. The visual hallucinations usually consist of simple forms – colored circles or parts of objects – that are constant or changing in size. People may also see the image of an animal or a person, and are more often in color. Auditory hallucinations are also common, but other senses are seldom involved. Hypnagogic hallucinations are dreams that intrude on wakefulness, which can cause visual, auditory, or touchable sensations. They occur between waking and sleeping, usually at the onset of sleep, and can also occur about 30 seconds after a cataleptic attack. Hypnagogic hallucinations are a feature of narcolepsy.

More information on hallucinations

What are hallucinations? - Hallucinations are sensations that are not real. Any of the senses can be involved. Illusions are different from hallucinations.
What is auditory hallucination? - Auditory hallucination occurs when people hear voices or other noises although nothing is there. Auditory hallucinations can range from primitive noises to speech and music.
What is hypnagogic hallucination? - Hypnagogic hallucination is episodes of seeing and hearing things as one is falling asleep. Hypnagogic hallucinations can occur at sleep onset.
What is visual hallucination? - Visual hallucination is the most common type of hallucination in dementia. Visual hallucinations can start with misinterpretations.
What causes hallucinations? - There are numerous medical and psychiatric causes of hallucinations. Some of the common causes include drugs, stress, sleep deprivation and/or exhaustion.
How is hallucination diagnosed? - Aside from hypnogogic and hypnopompic hallucinations, more than one event suggests a person should seek evaluation.
What're the treatments for hallucinations? - Hallucinations that are symptomatic of a mental illness such as schizophrenia should be treated by a psychologist or psychiatrist.
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