Medical Definition of Hypnagogic hallucination

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Hypnagogic hallucination: A vivid dreamlike hallucination that occurs as one is falling asleep. The opposite of an hypnopompic hallucination which is a vivid dreamlike hallucination that occurs as one is waking up.

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Reviewed on 12/27/2018

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