Scientists reveal why octopuses change colour while they sleep – 7NEWS.com.au

With its eight legs wrapped around itself as if in a hug and its eye pupils narrowed to a slit, the octopus breathes evenly, its body a uniform whitish gray.
Moments later it begins to change colour – a mesmerising shift between burnt orange and rust red. Its eyes, muscles and sucker pads twitching as if it may be experiencing a particularly vivid dream.
Brazilian scientists say the shifts in colour, behaviour and movement are evidence of a sleep cycle – with the octopus switching between active…

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