
New research shows that blowing bubbles helps sperm whales to sleep soundly, hidden beneath the waves.
It actually stops them from floating to the surface during nap time.
While little is known about how sperm whales sleep, researchers believe that the ocean giants doze underwater for 10 to 15 minutes at a time with their heads facing upwards.
They keep away from the choppy waters of the surface while still remaining close enough to get a breath of fresh air if the need arises.
However, one issue has puzzled scientists. A sperm whale's head is massive—taking up nearly a third of its body—and filled with oil, wax and air.
Those materials float, so how does the species stay underwater without popping to the surface like a cork while they sleep?
Now we know, after researchers from the University of St. Andrews, Scotland, and the University of Neuchâtel, Switzerland, dug into the question with high tech underwater equipment.

They used devices that would allow them


