Why do people close their eyes when they sleep?

From a physiological point of view, the natural state of human eyelids is drooping, that is, when the human brain no longer controls the eyelid (eyelid) muscles, the human eyelids are drooping, that is, the human eyes are closed. When people sleep, the higher nerve centers of the brain are inhibited, so the muscles that control the eyelids must be inhibited and lose control of the eyelid muscles, so people sleep with their eyes closed.

From the perspective of adaptation of organisms to the environment: organisms and the environment in which they live are adaptable, during sleep, people's defense of the external environment is limited, and for animals, the role of the eyes is incomparable, and closing the eyes can play a protective role in it. Moreover, the human eye needs to be moistened, otherwise the cornea will become blurred and even blind, and closing the eyes can keep it moist enough.

Moreover, when a person is sleeping, the visual center is in a state of inhibition, so that even if the eyes are open and the object is imaged in the eye, the brain still cannot perceive it, which was the case before Zhang Fei was killed.

From the point of view of biological evolution: terrestrial animals, from frogs to other reptiles, birds, and mammals, all have their eyes closed when they sleep! Of course, humans did not hesitate to inherit it.

I think so:

When you open your eyes, you need to contract your muscles to do this, and when you sleep, the muscles of your whole body are relaxed, and the muscles that control your eyelids are also relaxed.

Some people sleep with their eyes half-open, because that's their relaxed state, maybe big eyeballs and small eyelids.

And the fish, the fish sleeps with his eyes open, because that state is his relaxed state.

What do you think?

The eyes are closed because the upper and lower eyelids are closed. The innervated muscle is orbicularis oculi muscle. This muscle contracts when the eyelid closes. The nerves innervating this muscle are parasympathetic. The parasympathetic nervous system is in a state of excitement when the body is resting. Therefore, the eyes are closed when sleeping.

Because when people are sleeping, the brain is equivalent to a computer, and when they sleep, people's brains are in a standby state, and all activities are stopped, except for the human body's memory bank, otherwise how can people dream! So, once the brain is in standby, any organ of the body stops to rest, and the muscles on the eyes also stop, so that the person will close his eyes when he sleeps.

Keeping the eyes open can affect the person's sleep. Dry eyes don't make it easy to fall asleep, or if you look at something, your brain reacts. So it's not easy to fall asleep.

When relaxed, all muscles are relaxed, including the eyelids. And the eyes need to be kept moist, and the tear glands will ensure that the normal activities of the eyes are not affected. But when people sleep, the tear glands are also in a resting state, and without rear supplies, the eyes have to be closed.

From a physiological point of view, the natural state of people's eyelids is drooping, and when the human brain no longer controls the eyelid (i.e., eyelid) muscles, the human eyelids droop. Further, when a person sleeps, the higher nerve centers of the brain are inhibited, so the muscles that control the eyelids must be inhibited and lose control of the eyelid muscles, so the eyes are closed when people sleep.

1.Because there are always things that people don't want to see. Even if you see it during the day, you can't see it at night.

2.You may not be able to see ghosts during the day. Easy to see at night. Just close your eyes. Save being scared to death.

3.It looks better to sleep with your eyes closed. If you sleep with your eyes stared. That doesn't become a national treasure.

Human instinct. The eyelid blinking is done to clear out the impurities on the eye.

Keep your eyes moist.

If you sleep without closing your eyes, open your eyes for a night.

The eyes will become red and swollen.

That's because the eye is also a part of the muscles

Therefore, it is also necessary to rest

It's the same with the liver

True eye opening is only caused by people's consciousness, and you will only achieve it in order to see something, do something, etc., and only when you really open your eyes. If I could break the rules, I'd rather close my eyes!

Because normal people can't sleep when they open their eyes. It's not a dolphin again. Left and right brain shifts are possible.

The eyelids are the door to the eyes, and the eyes are closed to close the door.

Because when you close your eyes, it's dark.

Because the eyes also rest.

This is a state in which the cells of the whole body are relaxed.

Relieves tension during the day.

You can also keep it open: Zhang Fei sleeps with his eyes open.

Because I can't sleep with my eyes open.

Because I want to meet with Zhou.

Then you try to sleep with your eyes open, that's a natural reaction.

Some people can sleep without closing their eyes, but I can't sleep without closing my eyes!

My sister didn't sleep with her eyes closed, and in ancient times, there were no people who didn't close their eyes when they slept.

If you don't close your eyes when you sleep, what are your eyelids for?

The result of full-body relaxation.

Why did Zhang Fei sleep with his eyes open?

My mom said I slept with my eyes half-open.

So what are your eyelids for?

In fact, there are also people who sleep with their eyes open, but most people don't have this function, if you think it's okay, you can also try to sleep with your eyes open, it is estimated that it is difficult to do.

Human nature, sleeping with your eyes open is different.