Light sleep, deep sleep and dreaming, these are the things you need to know

- Can't sleep - what to do Deep sleep plays a very important role in our health. Among the three stages of human sleep, light sleep, deep sleep, and REM sleep, which one is more important is not a multiple-choice question, because each type of sleep has an indispensable role, and a complete sleep is a combination of these three stages.

01How many sleep cycles do we go through in one night? When people are asleep, they look very calm, which leads many people to think that our brain is also resting when we are asleep. In fact, the brain is like a naughty child, and it is particularly naughty when it is asleep. What does the brain go through in a complete sleep cycle? Non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep make up a complete sleep cycle. If you can't remember, don't worry, just read it slowly. Non-rapid eye movement (NREM) sleep is further divided into 1, 2, 3, and 4 sleep stages. Sleep 1 and 2 are called light sleep, and sleep 3 and 4 are called deep sleep. After each light sleep and deep sleep segment, there will be a REM sleep segment. What are their specific characteristics? Move a small stool and let's take a deeper look.

02 Light sleep - the basis of sleep When we just fall asleep, our senses are blocked, but our brain remains active. Electrooculographic records show that our eyeballs move slowly during this period. Most people are not conscious during light sleep, but some people can maintain a certain degree of consciousness. Light sleep accounts for about 50% of total sleep for adults. The light sleep stage is the path to deep sleep and REM sleep, and we can hardly enter deep sleep and REM sleep directly from the awake state.

03 Deep sleep - repair a day's fatigue After light sleep, we enter deep sleep. For people in deep sleep, the EEG is presented as diffuse waves, so deep sleep is also called diffuse wave sleep. Our cells secrete the most growth hormone during deep sleep. We rely on this hormone for life to maintain bones and muscles. Moreover, it is also conducive to recovery from pain and improving immunity. Under normal circumstances, the time of deep sleep for adults accounts for 15-25% of the total sleep time. If a person sleeps for 8 hours at night, then his deep sleep time should be within 72 minutes to 120 minutes. 04 REM stage - a stage of a lot of dreaming In the early 1950s, Eugene Asersky, a graduate student at the University of Chicago, and his mentor Kleitman noticed that after a child fell asleep, his eyeballs would move rapidly in different directions. This is the REM sleep stage. REM sleep usually begins 90 minutes after falling asleep, that is, after the cycle of light sleep and deep sleep. This stage is the stage where dreams are most frequent. Many people think that dreaming means poor sleep, but it is not. During the REM sleep stage, people will integrate and process the information received during the day, and then transform temporary reserve memory into permanent memory. This process is very complicated. Therefore, people who work with their brains often have many dreams, because they use their brains too much during the day, and there are many things that need to be transformed and stored. In the early 1950s, Eugene Aserski, a graduate student at the University of Chicago, and his mentor Kleitman noticed that after a child fell asleep, his eyeballs would move rapidly in different directions. This is the REM sleep stage. REM sleep usually begins 90 minutes after falling asleep, that is, after the cycle of light sleep and deep sleep. This stage is the stage where dreams are most frequent. Many people think that dreaming means not sleeping well, but it is not. During the REM sleep stage, people will integrate and process the information received during the day, and then transform temporary reserve memory into permanent memory. This process is very complicated. Therefore, people who work with their brains often have many dreams, because they use their brains too much during the day, and there are many things that need to be transformed and stored. Our sleep at night is a normal alternation of light sleep, deep sleep and REM sleep. None of them can be missing because they have their own functions, and the time of deep sleep is definitely less than that of light sleep. We can infer the time of deep sleep that should be obtained based on 15-25% of the total sleep time. Moreover, there is no need to be dejected even if you don’t sleep well. Sleep accompanies people throughout their lives. If you didn’t sleep well last night, as long as you don’t worry and accumulate enough sleep motivation, you can sleep well tonight. The most important thing is to have the right cognition, the right method, and the ability to adjust sleep. Are you still afraid of not being able to sleep well?