We've been kind of assuming not. But they have two alternating sleep stages...active and quiet sleep. And one of them might resemble REM sleep.
This would make dreaming far more universal than we thought. We used to think it was only mammals and birds, but it's at least some reptiles.
And now octopuses and cuttlefish.
Is dreaming essential to the working of any kind of biological computer?
Do octopuses have nightmares?
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