Sleep-related hallucinations that occur at sleep onset are called hypnagogic hallucinations. They are vivid experiences that usually involve multiple senses as a person transitions into sleep. These hallucinations can be startling but are generally harmless.
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The correct term for sleep-related hallucinations occurring at sleep onset is hypnagogic hallucinations. These are vivid experiences that can involve multiple senses and are typically harmless. Hypnopompic hallucinations, in contrast, occur upon waking. ;