We don’t yet know if they dream in color, but one thing’s for sure: they literally change color while they sleep.

A finding that intrigued scientists at the Federal University of Rio Grande do Norte and Washington State University.

According to a study published in the journal Science, even when they’re asleep, octopuses remain surprisingly active: they move their arms, change their coloring and show intense brain activity.

They too have… sleep cycles.

The researchers observed that these phases resembled a very active sleep, comparable to that in which humans dream. This suggests that octopuses could be experiencing a form of “dreaming”… even if we don’t yet know exactly what’s going on.

Further proof that marine life is full of fascinating mysteries, even at rest.