The male octopus was repeatedly filmed violently jolting awake from sleep and engaging in unusual activities, but exactly what prompted this odd behavior is unclear.
Scientists have filmed an octopus exhibiting strange behaviors in a laboratory in New York that could be explained by it having nightmares. Over the course of a month, researchers watched as the octopus appeared to jolt out of a restful sleep and thrash around, in a behavior that seemed almost like the animal was suffering from some kind of sleep disorder.
Video footage from a laboratory at The Rockefeller University in New York captured four episodes in which an Octopus insularis named Costello appeared to sleep calmly in a tank before suddenly flailing its tentacles around in a frenzy. In two of these instances, Costello also shot a jet of black ink into the water, a common predator-defense mechanism.
Recently, researchers have learned more about octopus sleep. In 2021, scientists published a study documenting evidence of a two-stage sleep pattern in the animals, consisting of “active” and “quiet” sleep — similar to how humans fluctuate between rapid eye movement and non-REM sleep each night. In humans, most dreaming occurs during REM sleep, so some scientists have wondered if octopuses may also dream during their “active” sleep stage.
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