>Would this imply that dreams developed some 500 millions years ago or that the different trees of the animal kingdom both developed the ability? Cephalopods h

>Would this imply that dreams developed some 500 millions years ago or that the different trees of the animal kingdom both developed the ability? Cephalopods have much, much more complex brains than the other mollusks (such as gastropods or bivalves), so the latter is more likely.