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A comment on The Octopus: An Alien Among Us. Parent comment

Re:The Octopus: An Alien Among Us by zacharycohn on Thursday September 26, 2019 @06:20PM (#21086194)
What do you mean if dreaming evolved twice - are you implying only humans dream? Because my dog dreams.
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Re:The Octopus: An Alien Among Us by albemuth on Thursday September 26, 2019 @06:32PM (#21086302)
Either a common ancestor of mammals and cephalopods dreamt or it evolved (at least) twice.
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