Can sleep deprivation cause hallucinations?
Yes. After about 24 hours of sustained wakefulness, mild perceptual distortions begin. By 48–72 hours, visual and tactile hallucinations are common, even in healthy people.
The timeline
Sleep deprivation studies show: 24 hours → mood disruption, slowed cognition. 48 hours → microsleeps, perceptual distortions. 72+ hours → frank hallucinations and reality-testing failures.
The mechanism
Sleep loss disrupts the balance between bottom-up sensory processing and top-down inhibition. The result is misinterpretation of normal sensory input as something more meaningful or threatening.
Recovery
One night of recovery sleep typically eliminates hallucinations entirely. Chronic short sleep does not produce hallucinations but does cause subtler perceptual issues.
Sources
- Matthew Walker, Why We Sleep (Scribner, 2017). Why We Sleep: Unlocking the Power of Sleep and Dreams
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