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 Dream, pre-sleep
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Dream, pre-sleep: Also called a hypnagogic hallucination, this type of dream is characteristically vivid and occurs as one is falling asleep or awakening.