A dive into the minds of sleeping octopuses has yielded further evidence that these enigmatic cephalopods experience REM sleep, or something very similar.
; a quiescent one characterized by washed-out colorlessness, and an active, REM-esque one characterized by vivid flickering color changes, cycling through at 30- to 40- minute intervals.
The next step was to record what happens during this period. The researchers found the nocturnal octopuses went very still and flat during the daytime, closed their eyes, and turned white. Roughly every hour this would change: for about a minute, the skin of the octopuses would flicker through a series of patterns, their eyes and limbs would move, and their breathing would quicken, before settling back down to the quiet state.
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