Why Spend Precious Lives Sleeping

When others find that you often stay up late, they will always advise you to say endlessly-“Sleep is really important”, “Stay up late will die early,” “If you don’t sleep after 11 pm, you will affect the hematopoietic function.” Recently, a group of German psychiatrists has proved from the perspective of brain neurons that sleep is indeed important. Lack of sleep prevents the brain from “restarting”, and neuron activities fall into chaos, which affects health and hinders learning and memory.

Related research is contained in the paper entitled “Sleep recalibrates homeostatic and associative synaptic plasticity in the human cortex” by the University of Freiburg Professor Christoph Nissen led the team and published it on August 23 in the 7th issue of this year’s academic journal Nature Communications.

Why do we sleep?

This is a very basic question. Why do we spend so much time in this brain state (referring to sleep) in our lives? This study tells us that sleep is a highly active brain process, not a waste of time. Sleep is necessary for healthy brain function.

Research results show that even overnight insomnia is enough to block the brain’s “restart” mechanism, and brain neurons that lose their rest will be overloaded. Overactive brain wave activity will make neurons unbearable, making it difficult for you to remember Live things.

This result further proves the “synaptic homeostasis hypothesis” (SHY) first proposed by researchers at the University of Wisconsin-Madison in 2003 in the United States. According to SHY, when we are awake, the brain will continuously absorb and process information, that is, learning, at this time the synapses between neurons in the brain will become more and more tight, and a large amount of energy is consumed in the process. And sleep can slow down the tightening of these synapses and stabilize our learned memories so that we can regain our previous learning progress when we wake up.

In the paper published on the 23rd, Prof. Christoph Nissen’s team performed brain and nerve experiments on 11 men and 9 women aged 19 to 25. They were divided into two groups. One group could sleep well, and the other group had to stay up all night and could not consume caffeine. Researchers would also supervise that they should never fall asleep.

After one night, the two groups of subjects were connected to the instrument, and the neurons were stimulated by magnetic pulses, which caused convulsions in their left hands. The results showed that a group of people who did not sleep experienced weak magnetic pulses enough to twitch their muscles, because their brains without rest were in a more excited state, and neurons were more tightly connected.

Later, the researchers used a method of stimulating neurons to simulate human brain activity while remembering one thing, and found that a group of people who did not sleep were very weakly sensitive to the stimulus. Combining two experimental steps, the study concluded that sleep calms the brain from activity and allows memory to be written down.

In addition to demonstrating that sleep is really important, the study has an unexpected gain, or it may bring new hope for the treatment of depression. In the field of depression treatment, there has been a method called “therapeutic sleep deprivation”, and the research team proposed that because lack of sleep can cause the brain to “chaos”, it can help people in a short time Quickly forget negative emotions within. Professor Christoph Nissen said that if people with depression are forced not to sleep overnight, 60% of patients will experience a significant improvement in mood.

7 hours
The National Sleep Foundation believes that adults under 64 need to sleep 7 to 9 hours a day, and adults over 65 should sleep 7 to 8 hours a day.

The human brain is like a computer. It needs to wait for a while or restart, and clear the memory. Otherwise, even if the memory is large and the hardware is good, it will still overheat, become more fragmented, and become slower.

Both learning and memory require a lot of synaptic activity, and this activity consumes energy and is easily saturated. Sleep allows the brain to reorganize after a day of active synaptic activity.

Neurons, also known as neurons or nerve cells, are one of the structural and functional units of the nervous system. Neurons make up about 10% of the nervous system, and most of the rest are made up of gelatinous cells. The basic structure consists of dendrites, axons, myelin sheaths, and cell nuclei. The transmission forms a current, which is a receptor at its tail end, which is conducted by chemicals (dopamine, acetylcholine). After an appropriate amount is transmitted, a current is formed between the two synapses. There are about 86 billion nerve cells in the human brain. About 70 billion of them are cerebellar granule cells. There are three types of neurons according to transmission direction and function: sensory neuron (also known as afferent nerve), motor neuron (also known as efferent nerve), and interneuron. (Source from Wikipedia)