Do fish sleep, or are they just resting in a state of suspended animation?
In short: While humans and birds are easily identified by closed eyelids and specific brainwaves, fish present a much more complex puzzle for researchers trying to define what true sleep looks like underwater.
Most fish do not sleep like land mammals. Instead, they enter periods of rest by reducing their activity and metabolism, often while remaining alert to potential predators. This state of suspended animation may serve the same restorative functions as sleep in humans.
Resting strategies vary wildly across species. Some fish wedge themselves into coral or mud, while others float in place. The Pacific sand lance even employs a unique method, burrowing into the sand to conserve energy and avoid being eaten.
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- Summary by Intellect · source: Do Fish Sleep?
- Also: Do fish sleep?
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