Fish Exhibit Four Sleep States, Including Three with Eye Movement, Suggesting Complex Sleep Patterns

Researchers have identified four distinct sleep states in fish, including three that involve eye movements. The discovery suggests that sleep may be more complex in fish than previously thought.

The research team’s findings indicate that fish experience sleep phases similar to those observed in mammals. One notable similarity is the presence of rapid eye movement (REM) during certain sleep stages. In mammals, REM sleep is associated with vivid dreaming. The identification of multiple sleep states in fish, particularly those involving eye movements, suggests a potentially more intricate sleep architecture in these animals than scientists previously understood.

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Date: May 6, 2026

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GOAI