NPR reports
Octopuses have alternating periods of “quiet” and “active” sleep that make their rest similar to that of mammals, despite being separated by more than 500 million years of evolution.
During their active periods of sleep, octopuses’ skin color changes and their bodies twitch, according to a report in the journal iScience, and they might even have short dreams.
Read more Octopuses, Like People, Seem To Have Active Stages Of Sleep, May Dream : NPR
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