The human body generally goes from deep sleep to light sleep for a few hours

Human sleep is divided into REM (rapid eye movement) and NREM (non-rapid eye movement) sleep, which together take about 90 minutes. NREM sleep followed by REM sleep, NREM is generally considered light sleep, which lasts about half an hour to an hour, usually one hour; REM is generally considered to be deep sleep, which lasts for about half an hour (dreaming period), with light sleep followed by deep sleep, and if deep sleep goes to light sleep, it is half an hour.

The effect of sleep on the appearance and beauty of the human body is related to the following physiological effects of sleep. When the human body is in a state of sleep, the body will produce the following changes: First, the body stretches.

The muscle tissue is in a state of complete relaxation, and the neuromuscular movement processes of the limbs such as human posture and posture produced by sensitive and coordinated movements during the day disappear; Second, the cerebral cortex is in a state of internal inhibition. During the day, the cerebral cortex is restored and relieved during sleep due to the heavy work of receiving information from the nervous system throughout the body. Human sleep is in a process of change from shallow to deep.

The first is the first sleep period, when the muscles are in a relaxed state and the internal organs are relatively stable; The second is the light sleep period, that is, when you have just entered a sleep state, you are particularly easy to be woken up; the third is the period of moderate deep sleep, in which consciousness disappears for about 1 hour; The fourth is the deep sleep period, which is more deep and heavy, and the time is about 30 minutes. Repeat after that.

Going through 4 to 6 rem and NREM sleeps in one night, which together has the hope of multiplying 4 6 = 2 3.

The average person enters a deep sleep, it takes two to three hours, and the sleep at this time can be called the highest quality sleep, but there are always some people who sleep very lightly, but they are eager to sleep better, then you can try some methods, such as drinking a cup of sleep fragrance before going to bed, which can shorten the time to fall asleep and help sleep.

Light sleep is actually the most sensitive, deep sleep is more dead, deep sleep is about 2 to 3 hours after you fall asleep, but deep sleep only lasts half an hour to a maximum of an hour and a half, and then you go into light sleep.

Fall asleep for 30 minutes to 60 minutes into deep sleep. If you don't enter a deep sleep during this time, it will affect the sleep of the whole night, if you want to have a good sleep, drink two packs of sleep fragrance with warm water every day, and insist on taking it for a period of time, you can have a good sleep, which can shorten the time of awakening before going to bed and the time of falling asleep, and promote deep sleep.

Hello, people's need for sleep time varies according to age, generally speaking, newborns need up to 15 hours of sleep, toddlers need 9 11 hours, teenagers need 8 10 hours, adults need about 7 9 hours, and the elderly need a slightly shorter sleep time, around 7 hours. Deep sleep is a stage of sleep that accounts for only 25% of the total sleep time. At this stage, the brain does not carry out any activity, which can relieve the fatigue of the day and boost the body's metabolism.

On the night you sleep, go into light sleep and then naturally go into deep sleep, then light sleep and then deep sleep, alternating back and forth until you wake up. Deep sleep, also known as "** sleep", is a very important stage of the sleep cycle and is closely related to sleep quality.

It takes about 6 to 8 hours of normal sleep, and about 2 hours of deep sleep is enough.

Generally, you need to sleep for six hours, and deep sleep is the kind that sleeps deeply and is not easy to wake up.

Hello, I think people should sleep normally and should not work for eight hours, but now people don't sleep at night and wake up in the morning, which is harmful to physical health, I think it is better to go to bed early and get up early, I hope young people must pay attention to their physical health.

Six hours. Deep sleep is a high quality sleep.

The normal sleep time of people is 8 10 hours, and deep sleep only accounts for 25% of the sleep time, so it can be calculated that the normal deep sleep time should be 2 hours. But it also varies from person to person, it is best to form your own relatively fixed schedule, fall asleep before 22 o'clock as much as possible, as long as you don't feel sleepy after waking up in the morning!

1. It takes two hours of deep sleep a day. Normal people's sleep is roughly divided into two cycles, and according to the changes in brain waves, muscle waves, and eyeballs during sleep, the sleep cycle is divided into non-rapid eye movement (REM) and rapid eye movement (REM) periods. Among them, the non-REM period is divided into phase I, phase II, phase III and phase IV, which are light sleep, light sleep, middle sleep and deep sleep, and then enter REM sleep, which is the end of a sleep cycle, and then start the next sleep cycle, with 4-6 cycles a night.

Studies have shown that about 25% of the entire sleep cycle is the period of deep sleep, i.e. phases 3 and 4, during which the cerebral cortex is in a state of adequate rest, which is essential for eliminating fatigue and restoring physical strength.

2. Deep sleep accounts for about 25% of the entire sleep time. Under normal circumstances, a person's deep sleep time is two hours, and the baby's deep sleep time will be relatively longer, these two hours are also called **sleep period, accounting for about 25% of the entire sleep time, deep sleep can relieve the fatigue of the body, and it is also the best sleep quality for a period of time.