Why sleep as the title Thank you

About one-third of a person's life is spent in sleep, which seems to be a fundamental element of biology, but scientists still don't know it. According to the British magazine New Scientist, scientists have come up with several theories about the cause of sleep, ranging from simple theories to complex theories involving memory processing, but none of them have been confirmed. Sleep is made up of two completely different states:

One is fast-wave sleep, when the eyes are constantly turning and the brain is very active, and most dreams appear during this period; The other is slow-wave sleep, which is a deeper state of unconsciousness. The roles of the two states are obviously different, but they are inexplicably intertwined. In natural sleep, slow-wave sleep is always followed by a period of fast-wave sleep, so it's likely that their functions are interrelated in some way.

Sleep is at the service of the brain. One of the reasons is that animals sleep and plants do not sleep, and other organs of the human body, such as muscles and liver, do not rest. This year, scientists have confirmed that the cerebellum sleeps.

This suggests that sleep is a brain-wide phenomenon, and researchers are beginning to agree that at least slow-wave sleep is the time when the brain repairs free radicals and causes damage. Free radicals are by-products of metabolism and can damage the body's cells. Other organs can mend this damage by giving up and replacing damaged cells, but the brain can't do that.

Therefore, slow-wave sleep is like a team that repairs a highway at night, working in the dead of night. So what is fast-wave sleep? Some researchers have suggested that this is a tinkering made by the brain when examining slow-wave sleep.

Other researchers believe that it is related to early brain development, but they do not know for sure. It seems that this issue will have to be left to be resolved later.

Because you have nothing to do, who sleeps when you have something to do? For example, if you hand in your homework tomorrow at 6 o'clock, can you sleep if you don't finish writing?

Because it will be sleepy, the cells will have to rest.

Sleep, generally referring to human sleep, is an indispensable physiological phenomenon for human beings. In a person's life, sleep accounts for nearly 1 3 of the time, and its worst is closely related to human health, which shows how important sleep is to everyone.

If you don't sleep, you will have dark circles under your eyes. If you don't sleep, you don't live long.

Because it is very tired, the biological clock has formed inertia.

Sleep is necessary for the body to rest.

Don't you sleep? In order to nourish the spirit.

In order not to sleep during the day the next day.

To put it simply, sleep is rest, for a better work and life tomorrow.

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!

It's the same as why people drink water and eat. There are two sides to everything, opposites or opposites. This is the law of nature.

In addition to the above two theories, there is a complementary theory called evolutionary theory. According to the theory of evolution, in addition to the need for sleep, the reason why various animals, including humans, exhibit various types of sleep patterns is mainly due to long-term evolution in the process of survival. Humans sleep at night and have a fixed location because they lack the ability to walk at night; In order to ensure safety from wild beasts, the ability to adapt first to nests and then to build houses has evolved.

Animals such as cows, sheep, and camels sleep in stages, because they live in the open all year round, have no fixed place to live, and must sleep and rest at any time, wake up at any time, so that they can escape at any time when they encounter an invasion. The diet of such animals is indefinite and timeless, because they live in the grassland area and have grass to eat at any time. In addition, some animals, such as frogs and snakes, are unable to forage for food in the cold winter and lack the ability to migrate like migratory birds, so they have evolved the ability to hibernate after long-term adaptation.

Sleep is a necessity for the individual, and what will be the impact on the body and mind of a person if they are deprived of sleep time for a long time? In the past, psychologists have conducted many experimental studies, and the results obtained are quite consistent, and the results are quite surprising. In the sleep deprivation (not being allowed to sleep or voluntarily not sleeping at the time of sleep) experiment, the longest time recorded was 200 hours (more than eight days).

The results showed that except for extreme fatigue and drowsiness, there was no significant abnormality in the physical and mental functions of the subjects. Some psychologists have even found that subjects who have not slept for 11 consecutive days have not been greatly affected in the performance of intelligence tests.