Why do your eyes always be dry and astringent when you 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 have inherited it without hesitation!

Nowadays, there is an increase in the number of people who feel that their eyes are irritated and they get tired easily. About 60% of patients with eye fatigue have dry eyes, and the surface of the eye is covered by a tear layer, and tears are secreted from the lacrimal glands, which moisten the surface of the eye by blinking and at the same time drain from the punctation located at the inner corner of the eye. There are two reasons for dry eyes, one is due to the decrease in the amount of tears, and the other is the increase in the evaporation of tears.

The reduction of tears is characteristic of modern people. Tears are difficult to flow out during stressful conditions and decrease at night.

Tears also decrease with age. Office automation equipment, night owl lifestyles, increased social pressure, and dryness due to the spread of air conditioners are contributing to the reduction of tears.

In addition, the increase in evaporation is due to the fact that the number of blinks decreases due to staring at the image of computers and game consoles; The layer of oil located on the surface of the tears has become unstable for some reason. The oil layer is secreted from the sebaceous glands of the eyelids, which are located at the edge of the eyelids, but are often clogged.

If you use a towel to warm your eyes, it will improve blood circulation and eliminate eye muscle fatigue. There are several ways to prevent dry eyes: (1) consciously increase the number of blinks; (2) Enlarge the text of the surveillance, lower the picture, and don't open your eyes too much; (3) Do not face the wind of the air conditioner; (4) increase the humidity around the eyes; (5) Spot artificial tear type eye drops.

Hello, dry eyes are generally caused by many reasons, generally seen in excessive use of eyes, for this situation is very important dietary therapy, eat more carrots, beans, red dates. The liver and lean meat of dairy animals can be properly supplemented with vitamins A, C, and EYou can take some Chinese medicine wolfberry chrysanthemum rehmannia pills.

Wishing you good health.

Hello, you may have overused your eyes for a long time. It may also be one of the ocular manifestations of vitamin A deficiency. The cause of vitamin A deficiency is mainly caused by the high consumption of vitamin A in the body and the low intake.