Octopuses have been shown to have personalities, the capacity for emotion, the ability to play, as well as expert problem-solving skills...
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Sidarta Ribeiro led the new study. He tells Inverse that once a creature’s brain reaches a certain level of complexity, they may need cyclical sleep to properly integrate information across the brain, learn, and form memories.
In humans, REM sleep is when we dream. If octopuses also experience something like REM sleep — the active sleep state — then it is possible they might dream, too.