Why do we close our eyes when we sleep - the simple question that scientists also have to scratch their hair

Some people close their eyes when they sleep, others sleep but still open their eyes, eyes closed . answers will surprise you.

Most of us close our eyes when we sleep. But have you ever wondered why that is yet? It is a seemingly simple question but not simple at all.

So far, the scientific world has not been able to explain in detail the main reason why we close our eyes when we sleep.

However, experts assert that closing your eyes will help us get a better and deeper sleep.

And here are a few examples that experts give to explain this.

According to experts, close your eyes when sleeping will help us prevent the external visual stimulation conditions such as light, dirt - factors that can harm the eyes.

Not only that, but if you do not close the "window of the soul" and leave it "open" all night, the eyes will lose large moisture, become dry, cause damage to the eyes.

In addition, scientists say that closing the eyes when sleeping is like "turning on - off" the body switch, signaling the body to release hormone melatonin causing drowsiness.

Melatonin is synthesized in the brain's pineal gland, playing the main role in running the body's biological clock.

At the pineal gland, melatonin receives information from the retina via a light and shadow model - to regulate the 24-hour life cycle.

So closing your eyes - letting your eyes not receive large amounts of light will speed up the process, making it easier to fall asleep.

However, there are also cases where it is reported that sleeping and opening the eyes. This is not just a strange phenomenon in sleep but also a pathology - so this state in the long run will affect the eyes, reduce vision .

According to experts, the case of sleep does not close the eyes quite a lot of causes such as paralysis of motor nerves to open the eyes, facial muscles are damaged, or due to brain injury, atrophy or paralysis of facial muscles, or genetics .

Some other cases sleep with half-closed eyes. This is a sleep disorder called Nocturnal Lagophthalmos - making sleepers unable to fully close their eyelids. The cause of this phenomenon may be due to facial nerves, or skin disorders .

So if this is the case, you should go to the doctor for appropriate treatment.