Octopuses Dream in ‘GIFs,’ New Experiment Suggests – Gizmodo Australia

Two years ago, a PBS documentary video showed an octopus named Heidi in what appeared to be an active dream state. Her arms twitched as she slumbered, and her skin flipped wildly through all sorts of alien textures. Most dramatically, however, the cephalopod changed colours, flashing in greens and reds like a malfunctioning billboard.
Many interpreted these behaviours as dreaming, but it was hard to tell, given how little we know about cephalopod brains and, to a certain extent, cephalopod intelligence…

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