7 months, 2 weeks ago

Among primates, humans have the shortest sleep time, but sleep quality is the highest.

Humans have the best sleeping environment, not only sheltering from wind and rain, no noise, and even temperature can be controlled by air conditioning. For such a comfortable sleeping environment, in a shorter period of time, to achieve a higher quality of sleep, humans have worked hard for thousands of years. However, "Why do people sleep?" Why can't you sleep less for a while? This basic problem has not yet been understood!

In the early days of human society, the dim light was dim. Whether it was hunting or collecting, the efficiency was very low. It might fall off the cliff, fall into the river, swamp, or even enter the territory of the beast. Through natural selection, this behavioral strategy may evolve into the sleep we know now.

So don't go out and stroll around at night, it's better to sleep, your eyes are closed, and the day is over.

However, in the observation of other animals, people slowly discovered that many animals such as scorpions, cats, bats, mice, owls, hedgehogs, and wolves are nocturnal activities. With so many animals at night, the key is that cats and mice, as well as owls, are nocturnal activities. Wouldn't they often hit them?

What's more, if the animals can't hunt at night, what are these animals going out for?

More importantly, even if you want to avoid natural enemies, just take a warning, why should you sleep? Why should you lose your consciousness? This is not known to be eaten by natural enemies.

Sleeping to avoid natural enemies does not seem to be reliable!

Sleep plays a vital role in the brain development of infants and young children. Infants sleep about 13 to 14 hours a day, which is also an important time for each neuron in the brain to link.

Children who have insufficient sleep can have a significant adverse effect on treatment and cognitive development. If an adult does not get enough sleep, he can only complete the mechanical work. The things he sees and what he hears cannot be fully input into his memory.

Many studies suggest that sleep is an important process of memory formation and consolidation. During slow-wave sleep, hippocampal cells play back electrical activity during the previous learning process and can convert short-term memory into long-term memory.


Recently, there is a study in the United States that studies sleep-study sleep, allowing right-handed people to try to type on their left hand. After a few minutes of general training, their level will be improved, and then they will enter a platform period. If the experiment is conducted in the morning and retested after 12 hours, their accuracy will not increase much. And if they are trained in the evening and are tested after getting up, their speed will actually increase by 15%-20%, and the accuracy will increase by 30%-40%.

The relationship between sleep and the brain is constantly being revealed. The body's waste is cleared through the lymphatic circulation, while the brain has no lymphatic system and only the cerebrospinal fluid circulates. Cerebrospinal fluid, which is the water that soaks the brain, can act as a buffer and protect.

When the person is awake, the brain does not stop for a moment, and the cells expand. However, when sleeping, brain cells shrink to 60% of their original volume, opening up a lot of space. At this time, the flow rate of cerebrospinal fluid in the brain is 2 times faster than when awake. This flow can remove the metabolic waste deep in the brain.

It’s like everyone is working in the office during the day, and the cleaning aunts are very inefficient to clean up, and when you touch your feet, you will overturn your cup. However, in the evening, the employees have already got off work, making room for cleaning, and it is much easier to clean.

If you don't sleep, or if you don't have enough sleep for a long time, it's like the office has accumulated a lot of garbage and messy. Affecting work efficiency, the long-term accumulation of garbage will greatly reduce the service life of your house. For the brain, it causes premature aging. MRI scans of 60-year-old dementia patients suggest that their brains have undergone significant atrophy and appear to be like a 90-year-old brain. The occurrence of Alzheimer's disease may be due to premature aging of the brain.

Dream is a state of consciousness, an experience that occurs after falling asleep. When dreaming, the experience is very similar in many ways to the experience after waking up. The dream is full of images, sounds, breaths, tastes, touches and emotions. Dreaming can be remembered, even with clear memories of dreams the next day, and even dreams of similar scenes for several nights, like a series.


The state of sleep in different brain regions affects the formation of dreams. Resting on the prefrontal cortex area of ​​critical thinking and rational thinking, a series of incredible singular events occur in the dream; the visual area and the motor cortex are active and will make the dream come true. There will be a variety of movements and pictures; the amygdala that is in control of emotions will be active in dreams, which will cause many dreams to bring different emotions such as happiness, atmosphere, grievances; control the balance of the vestibular system to rest, the brain can not sense gravity, it will Produce the feeling of flying and swimming.

There is also a lot of analysis about dreams:

The tooth is gone - lack of self-esteem and worry about aging.
Being chased - there are fears and doubts about the situation in the depths.
In flight - there is a sense of control over life, or something positive is happening in life.
In the fall - the frustration of social status, money, and interpersonal relationships.
In the exam - the recent life rhythm is very tense, making people breathless.
No clothes - I don't want to face the hidden truth in my heart.
There is a saying in ancient China, "Thoughts are thoughtful, nights have dreams." When people encounter difficult choices in real life, they often find answers from their dreams.

Modern people often overdraw their bodies, shorten their sleep time to work, entertain, and even have to face the phone for hours before going to bed. We most despise sleeping, because sleeping seems useless, just like finishing a room and stacking quilts.

However, you have thought that it is a matter of insignificance and disdain that you are likely to reduce the incidence of future brain diseases.


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