It is well-known octopuses change their color while they sleep. A new study reveals the color changes characterize two distinct sleep states, "active sleep" and "quiet sleep". The findings shed new light on the evolution of sleep.
It is well-known octopuses change their color while they sleep. A new study reveals the color changes characterize two distinct sleep states, "active sleep" and "quiet sleep". The findings shed new light on the evolution of sleep.
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