I stood, floating, sleeping with my eyes open... "Mysterious Sleeping Method" of Marine Life
sperm whale slept in groups under the water in a standing position. Discovered in 2000. The photo was taken in 2017 by French photographer Stefan Grantot, who photographed a group of sperm whales sleeping in Mediterranean . The more the world of nature and animals understand it, the more mysterious and amazing it becomes. "Small questions" about the mysterious animal world were asked to environmental professionals with 36 years of experience.
Q: The elderly cannot feel tired no matter how much they sleep recently because the bed is not suitable. How do fish sleep when you are tired of sleeping on such a flat floor? It always floats in the water. When you sleep, will the fish go to the bottom of the sea to sleep? Fish have no eyelids, how do you know if they are sleeping or awake?
Answer: How do you distinguish whether a person is asleep? If you close your eyes, your breathing will also decrease. It is invisible, but the heart beats less and the muscles relax. brain wave has also changed. Another important change is the sluggishness. It comes from an expression that it doesn't understand, even if it's carrying it, if it's sleeping. In any case, the most prominent sleep signal is closing your eyes. But the fish have no eyelids. You don't have to wipe away the dust in the water. In addition, fish do not have the outermost brain neocortex. The biggest part of the human brain is the neocortex of the brain. Therefore, it doesn't even know the changes in brain waves. However, from the conclusion, the fish fell asleep. Do you have a fish tank at home? How about the fish in the fish tank when you turn on the light in the middle of the night? Most of them should drift in the water without moving, or lean against the rocks, stay still, and that's how you sleep. Of course, some fish sleep during the day and actively look for food at night. When the fish sleeps, the fish will also become dull. Some people have unique postures when sleeping. Do you know the fish's sleeping posture? A study in China shows that most animals float in the middle of the water like logs to sleep, but one quarter of them sleep in the middle of the water with their heads upwards. Some sleep with their heads down, or like humans, with their stomachs on them.
What ? Because they have to breathe outside the water, but what do you do when you sleep? By observing the aquarium's dolphin etc., we found that whales sleep alternate half of the brain. When half of the brain sleeps, the other half can breathe, one eye does not close, watching the predators and fish move. Dolphins mainly sleep for an hour or two at night. However, the sleep behavior of wild dolphins and large whales is not well known!
