When we first fall asleep, we will probably experience a few minutes of eye movement cycle. That is to say, our eye movements are still relatively frequent at this time, which means that this hazy gradual transition to shallow sleep takes about 10 minutes to half an hour, because the activity cycle varies according to the individual's sleep time, some people can fall asleep, and then they can quickly enter shallow sleep, which takes about one to two hours, and then enter a state of deep sleep. People can have a summary of experience in one night.
Deep sleep accounts for about 30%~40% of our sleep time, which is already quite high. Normal people sleep eight hours a night, maybe just over two hours. This is a kind of bedding for normal people to reach deep sleep. We seldom go into deep sleep during lunch break, because it is not enough for a sleep cycle. About 30~40% of our life is spent in sleep, which is a reversible rest activity unique to higher vertebrates. Using this time, the human body can recover quickly, the metabolic rate of the body is greatly reduced, the breathing is stable, and the body temperature drops, giving the body a longer recovery time.
Therefore, we should use the sleep cycle scientifically. For example, a sleep cycle is one and a half hours, and a person's scientific and reasonable sleep time is about seven and a half hours. Because sleep time is too short, our bodies can't get enough rest and sleep for too long. If it reaches six cycles, it will take about nine hours, which undoubtedly takes up too much time in our lives, and too much sleep is not good for us to keep active and maintain the level of metabolism. Therefore, the most scientific and reasonable sleep state under the investigation of big data is a little more than seven hours.