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SLEEPING WHALES: PHOTOGRAPHER REVEALS WHAT WHALES LOOK LIKE WHEN THEY SNOOZE

Posted By: admin June 29, 2021

Humans, dogs, cats, and many other mammals sleep in similar ways. We lay down,
close our eyes, and drift off into dreamland. Aquatic animals, however, can’t
just lay down on the ocean floor, so how do they rest? In a rare photo of
sleeping whales, a photographer revealed how these massive cetaceans get some
shut-eye, and it is a sight to behold.



Sleeping Whales
In July 2017, photographer Franco Banfi was freediving in the Carribean Sea when
he captured an image of six sperm whales napping. They were grouped together,
suspended in the water with their tails down, completely silent. The whales were
floating there at a depth of about 65 feet (twenty meters).



Less than two weeks later, french photographer and filmmaker Stephane Granzotto
captured whales exhibiting similar behavior while diving in the Mediterranean.

Scientists first documented this unusual sleeping strategy in 2008. They
published a study in the journal Current Biology in which they measured the
underwater activity of 59 sperm whales world-wide. They did so through the use
of data-logging tags, which they suction-cupped to the whales for a total of
569.2 hours.



The researchers discovered that whales spend about seven percent of their day
sleeping, in bouts of about ten to fifteen minutes at a time. This makes them
one of the world’s least sleep-dependent animals. Their study also confirmed
that the stereotypical sleeping fashion for these animals world-wide is to drift
in a vertical position, as the photographs suggested.



Sleeping Whales in Captivity
Scientists have previously studied sleeping patterns in whales in captivity.
They did this using an electroencephalogram (EEG), which monitors brain
activity, or by observing eye movements. This, however, is not feasible for
whales in the wild.



So how exactly do whales sleep? Let’s compare them to humans:

Humans are able to sleep for long periods of time because we are passive
breathers. This means that we are able to breathe automatically, and we don’t
have to worry that we’re going to stop breathing once we fall asleep.







By contrast, whales have to “think” about every breath they take. For this
reason, they fall into unihemispheric slow-wave sleep. This, essentially, means
they sleep with half of their brain. Scientists have observed this in captive
whales, and they believe that this could do more than just help them continue to
breath. It may also help sleeping whales avoid predators, maintain social
contact with each other, or continue swimming.



This could also be why they sleep for such short amounts of time. It also
explains why different cetaceans (aka marine mammals) sleep for such widely
variable amounts of time. For example, researchers have observed humpback whales
resting on the surface of the water for up to thirty minutes, Dolphins, on the
other hand, sleep at night for a couple of hours. In fact, bottlenose dolphins
appear to spend about 33.4 percent of their day sleeping.

Do Whales in the Wild Sleep the Same Way?
In short, the researchers aren’t sure. While sailing in a boat off the coast of
Chile, the whales did not wake when the vessel was approaching. In fact, they
did not come out of their slumber until the boat inadvertently bumped into them.
At that point, they startled awake and scattered.

According to the researchers, this suggests that unlike their captive
counterparts, whales in the wild may enter full sleep.







Upon further observation, they found that the sperm whales had a strategy for
entering into their sleep-state. First, they dove head-down to a depth that is
several times deeper than the length of their bodies. Then, they passively
turned their heads up and drifted toward the surface.



The researchers noted that further study of whales’ sleeping patterns will
require better procedures for measuring eye movements and other physiological
variables for out-of-captivity animals.

For now, we must let sleeping whales lie.



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