A marine bologist films this octopus changing colour while dreaming and it's spectacular How do they know it's dreaming? They aren’t completely sure. There has been research into cephalopod sleep and dreaming. But octopus brains are very very different from ours. They aren’t centralized, for starters. Instead, there are several bundles throughout their bodies. But they do exhibit brain activity and sleeping patterns similar to REM sleep, were just not entirely sure that’s actually what it is. So

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