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November 18, 2020 - Science Focus

Do fish sleep?

Do fish sleep?
Clown Fish Sleeping (?) in Coral© Photabulous!

Mucus beds and marine lie-ins: the strange (and downright surprising) science of fish sleep.

Although it sounds like a small-scale question, solving the mystery of ‘do fish sleep?’ demands a deep and surprising dive into aquatic biology.

Yes: at surface-level, many fish seem like they are snoozing at times. They become less responsive, with their heart rates slowing and overall movement limited. But this rest isn’t the same as human shut-eye. For starters, fish can’t actually shut their eyes – they don’t have any eyelids.

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