Why do most animals sleep on their stomachs, while humans sleep on their backs?

Animals basically sleep on their stomachs, they are different from humans, they weigh less, and then their physique is different from humans, humans are primates, the weight is relatively large, want the body to get a full and proper rest, lying down to sleep is a state of falling asleep at the beginning, but most of the time people sleep at night when it is a state of lying on the side.

The human body is relatively heavy, if human beings use the way of sleeping on their stomachs like animals, the body will be under greater pressure, especially the heart and chest, our breathing, the beating of our heart, blood circulation will be affected, and when sleeping on the stomach, our lower limbs can not get a good rest, because human feet and lower limbs can not maintain an upright state at the same time, so there must be a part of the rest. One of the most advantageous ways for humans to sleep is to lie on the right sideBecause most people's hearts lie on the left side and the right side, it can not only ensure good physical rest, but also reduce the burden on the heart.

Primates basically use the way of lying on their backs and lying on their sides, we look at some star baboons when they sleep, sleep on their side, sleep on their sides, lie down and sleep a lot, really sleep on the ground is not much, especially baboons and other large primates, because large primates and human body structure is very similar, just that their brains have not developed to the extent of humans, but the overall structure is the same, their lungs and hearts also need to get enough rest. Obviously, sleeping on your stomach is not enough to rest.

Human beings continue to evolve, because our ability to adapt to the external environment continues to improve, because the process of evolution is the process of adapting to the external environment, the external environment will not change greatly because of some human behaviors, at least before the advent of modern society, so we can only adapt to the environment How can the human body get a better rest, in the same environment, this is the reason why human beings constantly adjust their body structure, because we can get a good rest by lying down and sleeping on our side, So humans basically sleep lying down and sleeping on their sides, while animals themselves are more comfortable sleeping on their stomachs because they feel insecure to sleep lying down.

Sleeping habits are different, the structure of the body is different, the sleeping environment is different, animals pay great attention to places like the abdomen are more fragile, and habitually protect themselves.

This is the habit of every species, animals sleep on their stomachs to protect themselves, and humans sleep like this more comfortably and is good for the body.

This is because animals and humans have not evolved the same degree of evolution, and animals have not evolved arms in their limbs, so they sleep on their stomachs.

We humans sleep lying down, and many animals sleep on their stomachs or curled up. But the sleeping position of the horses is very peculiar, they sleep standing up. This is because their ancestors formed a survival habit in order to avoid natural predators when they were living in the wild; This, combined with the unique structure of their front leg bones, allows them to sleep standing without feeling uncomfortable.

First, because standing is conducive to escape.

Horses rest and sleep while standing, a habit they have been trained in the wild in nature. Before humans tamed horses, they lived in the wild. Life in the wild is very cruel, horses are herbivorous animals, and they are not very aggressive, and there are more natural enemies, so they must quickly escape when they encounter natural enemies.

In order to detect the crisis at the first time of encountering danger, they choose to sleep in a standing position. In this way, once the beast arrives, it can quickly detect and flee quickly. If he was lying down, he was eaten to death by a wild beast before he could escape.

2. The reason why you can't fall down when you stand up and sleep.

The reason why they don't fall is because of their special body structure. The center of gravity of the horse is in the middle of the horse's body when standing, with the front legs mainly responsible for 57% of the total body weight and the hind legs responsible for 43% of the total body weight. Because the weight of the front legs is relatively large, the front legs are mainly connected to the body by the shoulder girdle muscles.

When standing, the subthoracic serratus muscle has a strong static muscle, and the muscle fibers do not contract, so there is no energy consumption, so there is no feeling of fatigue. However, young horses and old horses sleep on the ground when they sleep because their muscles and tendons are not complete.

Horses are not good at fighting, but their ability to run is very strong, so they sleep standing because standing is conducive to observing the enemy's situation, and if they find a beast, they can react quickly and escape. It's their instinct to survive. But if it's safer, they can also rest or sleep semi-recumbent, but there must be a horse standing guard.

But only a single horse, then it will sleep standing no matter what time it is.

Because horses have developed this habit over a long period of evolution, horses have to sleep standing up.

Because the horse's legs are too long, it is uncomfortable to sleep on its stomach, so it is sleeping standing up.

Because of this, the adaptability is relatively strong, and the horse defends against natural enemies in this way, which is a particularly strong expression of the desire to survive, and the horse's front leg structure is particularly special.

1. The bat falls asleep upside down

Bats are very mysterious animals that have a very peculiar sleeping position that allows them to fall asleep upside down. And you can sleep 15 to 20 hours a day. The bat's feet are very special, with special tendons that allow the toes and claws to easily lock themselves in there while they remain still.

2. Giraffes can sleep standing up

Giraffes have very long necks, but they can still sleep on their stomachs, and in this position they will tuck their legs under their bodies and rest their heads on their backs. However, for adult giraffes, sleeping in this position is usually only possible for a few minutes. In the wild, giraffes may also sleep in a standing position.

In this way, they are better able to protect themselves and spot predators more quickly.

3. Dolphins sleep with only one eye closed

Dolphins, like humans, are nucleated milk-feeding animals, not fish. Dolphins seem to breathe through their lungs, and they must often go to the surface of the water to get oxygen. The blowholes on the top of the dolphin's head act like a "nose", making it easy for the dolphin to surface to breathe air.

Dolphins have a unique way of sleeping, called unihemispheric sleep. While they are in this state of sleep, one side of the brain is in a state of "wakefulness" and the other side is in a state of deep sleep. During this time, the eye opposite the sleeping brain is open, while the other eye is closed.

4. Birds can sleep while flying

Scientists were shocked when they first discovered that birds were sleeping during an airplane. For example, 15 adult female birds were tracked and studied by scientists over a 10-day period.

It was found that during the daytime hours, the birds remained awake and searched for food. However, when the sun goes down, the birds will fall into a slow-wave sleep for the first few minutes as they continue to fly over the water. Usually when entering this condition, the bird will hover in the upward air current, but half of the brain will remain active and the other half will stop working.

5. The otter snoozes hand in hand

For some humans who love each other, they may hold hands while they sleep. But in fact, humans are not the only creatures that can do this, there is one critter in nature that is even more focused than humans.

Because they not only hold hands when they sleep, but also float on the water. They do this to prevent otters from sleeping away from each other and their food**. And it will take 11 hours to rest.

Horses, zebras, donkeys, giraffes, elephants, chickens, ducks, and geese sleep standing, but sheep and oxen sleep on their stomachs, and camels sleep on their stomachs. In fact, many of the behemoths are standing. Many birds sleep standing on one foot, such as flamingos, owls, etc.

Sleeping position refers to a postural state when humans and animals are resting.

Beautiful mallards and swans hunt and play in the water during the day, and they can't do without their favorite water surface at night. They bend their long necks, bury their heads in their wings, and float themselves on the water, dreaming and drifting with the current.

Long-legged birds such as cranes, storks, and herons always sleep on one foot, and change to the other when they are tired, which is a model of combining work and rest.

Partridges like to sit in a large circle when resting, and then all head outward and tail inward. In this way, no matter which direction the enemy is attacking from, they can detect and flee in time.

1. Tigers sleep lying down. 2. The fox is slumped when it sleeps. 3. When the chicken sleeps, squat and sleep with its head down.

4. Horses sleep standing up. 5. The kangaroo is to use its feet and imitation tail to prop up a triangular frame, and then lower the head and sleep with a snort. 6. Bats sleep upside down.

7. Dolphins always have one eye open and one eye closed when they sleep, and they change rhythmically every ten minutes. 8. Dogs often sleep with their forelimbs holding their noses, this is because their noses are particularly precious. 9. When the hedgehog sleeps, in addition to exposing its mouth and nose, it also curls its body into a spherical shape, with the spines erect and its nose slightly exposed.

It is an evolved instinct for donkeys to sleep standing up. In fact, the filming crew of the animal feature film once filmed a donkey sleeping on the ground. In 2008, an animal documentary crew filmed wild asses sleeping on the ground in the African savannah.

At the time, members of the film crew thought that the wild donkey might be sick. It is not a common phenomenon for donkeys to sleep on the ground, but they do exist individually. The donkey sleeps standing for its own safety.

In the vernacular, no donkey who sleeps standing dies early.

It is a genetic instinct for donkeys to sleep standing up, and they don't need to be taught by other donkeys. The natural world is highly competitive, and there is a predator relationship with ** food everywhere, and the animals at the top of the food chain are rarely sleeping standing up, with the exception of elephants. The reason why elephants sleep standing is because the ancestors of elephants were small, and at that time there were still many natural predators, and elephants had not yet had time to evolve the habit of lying down and sleeping.

In addition, elephants are huge in size and weigh a lot, so it is easier to move at any time while sleeping standing up, and lying on the ground and getting up again will consume their physical energy too much. This seems to be unnecessary damage that doesn't matter. There is also one, sleeping lying down, which can compress the internal organs of the elephant.

In any case, the more animals that have no natural predators, the easier it is to lie on the ground and sleep, which is generally good. Most animals such as donkeys sleep standing up, so that they can slip away at any time when they encounter danger.

The way birds sleep is very interesting, they sleep on high branches, and after they are asleep, they don't fall down. This is thanks to the unique construction of their claws. Birds' claws are different from humans, and human hands are loose in their natural state, and they are also the same when sleeping, and they only bend when they exert themselves.

The use of the claws of birds is reversed, and when the birds sleep or stand on the branches, the claws are in a natural locking state, and they are bent. It is only when the bird is in a state of taking off and leaping that the bird's claws are relaxed. Therefore, birds sleep while standing on the branches of trees, and it is impossible for them to fall down.

Some mammals, such as bats, hang upside down on tree branches but can't see them falling, and that's how it works.

Elephants also sleep standing up, and we rarely see elephants lying on their stomachs. Mainly because elephants weigh too much, they can die by pressing on vital organs such as the heart and lungs when lying down. Therefore, when the baby elephant is born, the mother elephant will use her nose to desperately help the baby elephant to stand and prevent the baby from lying down.

Horses, ducks, chickens, geese. Elephants, giraffes, flamingos. Red-crowned cranes, owls. Animals' sleep time and habits are also different, humans sleep lying down, but some animals in nature sleep standing.

Horses, zebras, donkeys, giraffes, elephants, and some birds also sleep on one foot, such as flamingos, owls, red-crowned cranes, etc.

Among mammals, giraffes, horses, etc. sleep standing up, and they sleep standing because there will be predators attacking them at any time in the grassland, and sleeping standing is convenient for escape. The elephant also sleeps standing because it weighs too much, and if it does not sleep standing up, its heart and other organs will be compressed.

Horses, and possibly horse-like animals, such as zebras.

Animals that sleep standing are:

Long-legged birds such as cranes, storks, and herons always sleep on one foot and switch to the other when they are tired.

Because the elephant is so large that it squeezes its internal organs if it lies down to sleep, it also sleeps standing up.

Horses sleep standing most of the time, when horses usually stand and rest, they tend to take turns to rest one hind foot, the resting foot is slightly bent and gently placed on the ground, carrying less weight, and the two front feet and the other hind foot carry most of the weight, much like a person's three or seven steps.

Giraffes sleep for a short time, only about 30 minutes a day, and they doze off standing up, their long necks hanging down; And sometimes they may lie down and sleep with their heads on their stomachs, but they sleep on their stomachs for a very short time, only about three minutes, and most of the time they sleep standing up.

Zebras, in the dangerous African savannah, group action zebras often stand up to sleep, encounter carnivore night attack, basically do not react, pull out the legs and run.