We know that octopuses change color when they sleep.
Scientists used to think that only mammals and birds have two sleep states.
"This makes us wonder if we can see two sleep states in octopuses.
To find out, the researchers took a video of octopus in the laboratory.
"What's more interesting is that this kind of'active sleep' mostly occurs after a long period of'quiet sleep'-usually more than 6 minutes, and there is a typical periodicity.
This cycle repeats every 30 to 40 minutes.
This discovery has interesting implications for the evolution of octopus and sleep, but it also raises interesting new questions.
"The sleep state changes of octopuses seem to be very similar to ours.
"If in vertebrates and invertebrates, two different sleep states have evolved twice, what is the evolutionary pressure to form this physiological process?" she asked, "cephalopods independently evolved similar to spine The'active sleep' of rapid eye movement sleep in animals may reflect a new characteristic of the central nervous system, which coexists in the complex central nervous system.
Medeiros also said that these findings increase the possibility of octopuses "dreaming.
In future studies, the researchers hope to record neurological data of cephalopods in order to better understand what happens when they sleep.
"It is easy to speculate that, just like humans, octopus dreams may help adapt to environmental challenges and promote learning.
Related paper information: doi.
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org/10.
1016/j.
isci.
2021.
102223" target="_blank">http://dx.
doi.
org/10.
1016/j.
isci.
2021.
102223
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