Symptoms of schizophrenia: These include hearing voices, having confused thoughts, and experiencing changes in behavior.Symptoms of narcolepsy: These include muscle weakness, being very sleepy during the day, and having disturbed sleep at night.If a person has any of the following symptoms, they may wish to contact a doctor. Hypnagogic hallucinations are not usually a health risk.Ĭertain medical conditions have links with these hallucinations. These hallucinations may happen at the same time as sleep paralysis. They may prevent a person from falling asleep. The images, sounds, or other sensations may last a number of minutes. Other symptomsĭuring a hypnagogic hallucination, a person knows that they are awake. People may feel as though they can hear voices, environmental sounds, or unidentifiable noises. The extra content of these sounds may vary between people. Hypnagogic hallucinations often have an auditory component. Images can be quite complex and detailed or may simply appear as blurs or misperceptions. They may include images of people, animals, or moving objects. Visual hallucinationsĭuring hypnagogic hallucinations, people will often experience visual disturbances. This sensation could be a feeling of falling or flying. These can be images, smells, tastes, tactile sensations, or sounds.Ī person may also feel as though they are moving while their body is still. A person will experience vivid hallucinations as they fall asleep or just before falling asleep.

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