Hypnagogic hallucination HP:0002519 Hypnagogic hallucinations are brief hallucinations that occur when falling asleep. SNOMEDCT_US:44780000 UMLS:C0233773 Hallucinations while falling asleep Hypnagogic hallucinations are typically reported as visual, auditory, and tactile sensations. Visual phenomena often consist of kaleidoscopically changing patterns, shapes, and flashes of light. Lifelike and highly detailed images of animals, people, faces, and scenes are also common, displaying a wide range of vivid colors. Auditory experiences, although less frequent, may include voices, as well as sounds like a ringing phone, doorbell, or music. These auditory impressions may involve words, names, conversations, or environmental and animal sounds. Additionally, hypnagogic hallucinations can manifest as somatic experiences, which include bodily distortions, feelings of weightlessness, sensations of flying or falling, and an eerie sense of a presence in the room. Sleep related hallucination Abnormal transition from sleep to wakefulness