In a nutshell
Brief images, voices, or sensations of touch can arise while falling asleep. They occur during the transition to sleep and are not the same as persistent perceptions while fully awake.
Why does it happen?
As sleep begins, processing of external stimuli and generation of internal imagery change. Dream-like content can already occur while part of attention is still directed toward the surroundings. The precise networks differ by sensory modality and sleep stage and remain an area of research.
Frequency
Many people report imagery or other sensory experiences while falling asleep. Estimates depend strongly on the question asked and recall of the transition into sleep.
Frequency is a qualitative description, not your individual probability.
Is it normal?
Occasional impressions right at the transition to sleep can be normal.
When to seek advice
Distressing frequent episodes, marked daytime sleepiness, or similar perceptions while fully awake should be discussed with a clinician.
Does this happen to you?
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Sources (1)
- The hypnagogic state: A brief update (opens a new tab)
Visual, auditory, and body-related perceptual impressions can occur in the transition between wakefulness and sleep.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
