It may be because 'I'm dreaming' that the octopus changes body color while sleeping
When people sleep, their brains may be awakened, which may cause them to dream or move their bodies unconsciously, but octopus may point out dreams as well as people It is. American public broadcasting
Watch The Mesmerising Color Shifts of a Sleeping Octopus
https://www.sciencealert.com/watch-the-mesmerising-colour-shifts-of-a-sleeping-octopus
You can see how the sleeping octopus changes body color in the following movie.
Octopus Dreaming-YouTube
Inside the aquarium is a female octopus named Heidi.
Heidi sticks to the top of the aquarium and sleeps
Heidi, which hardly moves, is getting thinner and thinner ...
Finally it turned white.
And at the next moment, it turns black.
Body color and patterns change rapidly while sleeping.
You can also check not only the body color but also the moment when the shape of the head changes and thorns grow.
In order to protect themselves, the octopus changes its body color and pattern in response to the surroundings it detects. According to scientific media Science Alart, octopus
Human sleep, the brain even if the body is asleep awake REM sleep repeat and, the non-REM sleep the brain is also the resting state. It has been said that REM sleep that dreams because the brain awakens is limited to mammals and birds including humans, but in recent studies the possibility of REM sleep also in other animals such as fish Has also been pointed out.
`` The origin of sleep '' may be able to go back 450 million years ago-GIGAZINE
Whether octopus sleeps REM is not clear, but during sleep, optic neurons excite and body color changes, so octopus may sleep with part of the brain awakened It is possible.
“If Heidi had a dream, it would be a dream,” said David Sir, a marine biologist at Alaska Pacific University who served as a narrator in a PBS movie.
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