It was once thought that the ability to dream was a peculiarly human trait. But a surprisingly wide range of species can do so as well.
in zebrafish based on the fishes' brain signatures. In one of the states, neural activity synced up like it does in a non-REM stage of mammals. In another state, the fish showed neural activity reminiscent of a waking state, as happens in REM.
Cuttlefish sometimes change colour while asleep, which suggests they may be reacting to events in dreams Observing multiple sleep stages in such an evolutionarily distant relative from ourselves, the authors suggested that different sleep types arose hundreds of millions of years ago. It's now known that flies, too, may flit betweenResearchers consider the possibility of non-human animals dreaming during REM-like sleep because creatures act out waking-like behaviours in this state – like the cephalopods' pattern-flashing or the spiders' spinneret-shaking.
REM sleep also has been linked to the replay of experiences in some animals. For instance, when researchers looked at the brain electrical activity of sleeping mice that had earlier run a maze, they sawand are linked with the head's direction, even though the rats' heads weren't moving. They also saw activity in neurons associated with eye movement. The combination suggests that the mice may have had a dreamlike experience in which they were scanning the environment, Ungurean says.
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