Why do people sleep for eight hours? We have been told by our parents and teachers since childhood that everyone should sleep for eight hours on each TV, but we never know why. So why do people sleep so long? Why do people sleep for eight hours? Let's have a look.

Why do people sleep for 8 hours 1? It seems that there is no need to worry about anything else now, just ensure 8 hours of sleep.

In fact, do you really think eight hours' sleep is a good sleep?

Sleep is one of the functions of the human brain. When this function is enabled, the functional activities of our human body are reduced, we fall asleep quietly, the brain temporarily loses contact with the environment, and the muscles do not move independently. After a period of time, we can wake up automatically or be awakened by appropriate stimuli. Sleep is an unconscious happy state that life needs periodically, or an active behavior, which has certain periodicity. Sleep at night, wake up during the day, be active, and have a certain sleep depth for normal sleep.

In other words, we emphasize the quality of sleep, so that the brain and body can get a full rest, thus ensuring the normal function of the next day, full of energy, not dizzy, quick thinking, effectively carrying out various activities, and not making mistakes.

See, the guarantee of sleep is a certain depth of sleep, so the quality of sleep is the key, and even if the time is counted, do you think that sleeping for 8 hours during the day can be compared with sleeping for 8 hours at night?

So sleep depends not only on time, but also on the timing of sleep.

Anyone who has read many books on Chinese medicine or health care will know that Chinese medicine sometimes gives people something more suitable to do at twelve o'clock. If you go to Baidu, you will find that he will advise us to go to bed before 1 1, because 1 1-in the morning 1 is the working time of gallbladder meridian, which is hematopoietic.

At this time, it is 3 o'clock in the morning, 3-5 o'clock, and the lungs are running, sending fresh blood that has just been poisoned to the whole body.

Have you ever found that from 9: 00 a.m. to 5: 00 a.m., four hours and eight hours are all physical exercises of qi and blood, while pushing Huanxin Chen requires quiet time? It happens that this time period is also the sleep time that we have been practicing since ancient times. In ancient times, people came home at sunset, because there was no sun at night and there was basically no lighting method, so they had dinner early when they got home at night.

If family members are active, they can chat around the stove at night. It's almost time to go to bed at 8-9 o'clock, and get up at 6-7 o'clock in the morning, because they have to work in the fields as soon as the sun comes out, and their' get up time' is 6-7 o'clock, which is why many people go to the toilet first thing when they get up.

Although the ancients didn't have much technology, it was precisely because of this that their lifestyle was more suitable for health. Sunrise and sunset, strictly follow early to bed and early to rise.

Here, we found that the reason why the ancients went to bed early and got up early was because there was no secret life at night, but now people have no trouble of getting dark when the sun goes down. Some people start as soon as the sun goes down, so it is difficult for us to get young people to do so.

So how can we have a better rest?

First, keep enough sleep time.

Although we said at the beginning that sleep time is not the key to ensure sleep quality, if you can't go to bed early and get good sleep quality, then use time to make up for it. The quality is not enough, time will come. But not too long, lest you ruin the day with your eyes open.

Second, the help of sweets

If you are a person with difficulty in falling asleep, that is, a person with melatonin deficiency, you can eat a small piece of dessert properly before going to bed. He can quickly relax your body, make your heart smile, make your mood more relaxed, and add a few minutes of soothing light music, which can help you fall asleep quickly. It's really hard to find a book, it's difficult and boring, and it may help you a little.

Third, hot water.

Many people can't sleep well and find it difficult to fall asleep, but after taking a hot bath, they find themselves very comfortable and sleep soundly. Some people can even fall asleep in the bathtub.

Many people can't sleep well because of stress, and their muscles are tense after a hard day's work. If they can relieve muscle tissue, they can also help them fall asleep quickly. Remember that some soothing things have this effect.

So whether it's drinking a little, taking a hot bath, or taking a hot bath if possible.

How to judge whether you sleep well? Let's give a few examples and judge for ourselves.

1, whether at least 3 times a week, lying in bed for more than 30 minutes can't sleep.

2, in the process of sleeping, there are more than 3 nights awake, and it takes time to fall asleep again.

3, dream more, wake up in a daze, fall asleep again, and dreams can be connected. (the last one is that it is difficult to fall asleep after waking up. )

4, easy to wake up when sleeping, and toss and turn.

5, after waking up (more than 6 hours, less than 6 hours is not enough sleep time) feel tired, poor spirit, slow response, poor cognitive ability. Simply put, I woke up with a confused face, and I don't know why I did it. It took me ten seconds or more to wake up.

If there are more than two problems, it is suggested to adjust your work and rest rules and give yourself a healthy body.

Why do people sleep for 8 hours?

Although the harm of too little sleep is well known, according to a new study, too much sleep may also be harmful.

Researchers at the University of California, San Diego, found that people who sleep for 9- 10 hours every working day seem to have more problems in falling asleep and sleeping quality, as well as other sleep disorders.

Sleep disorders include waking up in the middle of the night, waking up in the morning, unable to fall asleep again after waking up, and fatigue during daily activities.

In addition, compared with people who sleep eight hours a day, people who sleep only seven hours a night also say that it is more difficult for them to fall asleep and feel less energetic when they wake up in the morning.

According to the research results published in the journal Psychosomatic Medicine, people who want to have a good sleep may not have to set a sleep goal of more than eight hours.

Daniel Kripke, the author of the study, said that for people who sleep more than eight hours or eight and a half hours a night, it "may be a good idea" to consider reducing sleep time. But he also cautiously said that more research is needed to prove this point.

Previous studies have shown that long-term sleep deprivation is potentially harmful. For example, a report shows that if a person habitually sleeps less than seven hours a night, the risk of death in a certain period of time is higher than that of people who sleep more.

It can be seen that 6-8 hours of healthy sleep every day is the best!

Recently, foreign medical research found that many people who often feel tired are not sick or lack of sleep, but are caused by too much sleep! Why does excessive sleep affect mental and physical strength?

Because the blood circulation slows down during sleep, the nutrition and oxygen supply of the brain are greatly reduced. Sleep for too long, brain cells can't get enough oxygen and nutrition, so the activity ability is weakened. Too much sleep will reduce the activity of muscles and tendons, and muscles will get less oxygen and nutrition from the blood, so they will become relaxed and naturally feel tired.

Many people who sleep too much and feel tired can speed up their sleep, deepen their sleep and eliminate fatigue and powerlessness if they reduce some sleep time and take appropriate physical exercise.

So sleeping more is not a good thing.

According to the body's biological clock, it is beneficial to sleep at night around 1 1 o'clock, because brain activity and metabolism need to get a full rest between 10 and 2 o'clock.

Too long sleep, like lack of sleep, will lead to mental fatigue, physical fatigue and decreased metabolic rate. Sleep should not be too long. If you sleep too long, your heart will slow down, your metabolic rate will drop to a very low level, and your muscle tissue will relax. Over time, people will become lazy and weak, and even their intelligence will decline. So people should not sleep too long, 7-8 hours of day and night is enough for adults. If you want to increase your sleep time to get healthy, it will be counterproductive.

Increase disease and shorten life span.

Neonatal 20-22 hours February baby 18-20 hours 1 5 hours 2 years old 14 hours 3-4 years old 13 hours 5-7 years old 12 hours 8-/kloc-0. 7-8 hours (not less than 6 hours) 60-70 years old, 9 hours 70-90 years old, 10 hour, over 90 years old, not less than 10 hour.

Generally speaking, a normal sleep of 6-8 hours a day is enough. If you miss your sleep because of work or other things, you can make up for it according to the amount of delay. Generally, the total compensation does not exceed two hours. Do some usual activities after getting up, and you will be full of energy and everything will return to normal. Too much compensation is not only useless, but also makes you more confused and even makes you dizzy, which is similar to the situation described in your question.

This is because long-term brain relaxation and organ inhibition have a negative impact on the body's blood circulation and organs, resulting in hypoxia or malnutrition.

In short, sleep time varies from person to person, so it is impossible to set an absolute time. Usually we say that everyone has to sleep 8 hours a day to keep healthy, which is just an average. However, the proportion of ordinary people is still very large. The daily sleep time of ordinary people can refer to the basic sleep time value of about 8 hours.

Why do people sleep for 8 hours? How long is the best time for a person to sleep?

For most adults, sleeping seven or eight hours a night is enough. The American Cancer Society made a survey, and the average person who sleeps seven or eight hours a day has the longest life expectancy. In contrast, the mortality rate of adults who sleep less than 4 hours a night is higher than180%; Adults who sleep more than 10 hours a night have a higher mortality rate of 80%. However, people of different ages need different sleep times.

Generally 1 ~ 3 years old need to sleep 14 ~ 16 hours a day, 4 ~ 6 years old need to sleep 12 ~ 14 hours, 7 ~ 9 years old need to sleep 1 1 hour.

9 hours, people over 90 years old should sleep 12 hours. In addition, due to the change of physiological state, the sleep time required by the same person in different periods will also increase or decrease.

For example, women may sleep more during menstruation, and pregnant women often need more than 10 hours of sleep every day. After heavy physical labor or physical exercise, sleep time will generally be prolonged, while excessive mental labor will often reduce sleep. The quality of sleep does not depend entirely on the time of sleep, but on the quality of sleep, that is, the length of deep sleep during the whole sleep.

For example, some elderly people often sleep more than seven or eight hours a day, but they are still very sleepy all the time, mainly because the time for the elderly to really reach deep sleep and middle sleep is not long, and most of the time is spent in shallow sleep and shallow sleep, so the quality is not high. On the contrary, some people can sleep for a short time, but they can ensure a certain depth of sleep and get a good rest effect. They don't yawn often and feel "lack of sleep".

Therefore, the quality of sleep should not be simply measured by the length of sleep, but by whether fatigue is eliminated and whether energy is abundant.