Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Hypnagogic hallucination
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
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.