A analysis group at OIST = Okinawa Institute of Science and Technology Graduate University introduced that it was revealed that octopuses have a two-stage sleep cycle much like people. This is the primary time {that a} two-stage sleep cycle has been revealed in a non-vertebrate animal, suggesting that octopuses might have an identical phenomenon to human dreaming.
Source
Octopus Human-like two-stage sleep cycle OIST and different analysis groups | NHK
