How many hours is the scientific amount of sleep?

Generally speaking, the best sleep time for people of different ages is different, newborns need to sleep 20 hours a day, babies sleep 14 hours to 15 hours, preschool children sleep 12 hours a day, primary school students need to sleep 10 hours, middle school students need to sleep 9 hours, college students only need to sleep 8 hours, adults need to sleep 8 hours, and the elderly need to sleep 6 to 7 hours a day. Sleeping too long or too little is bad, so you should pay attention to the best time to sleep.

Everyone's sleep time is different, the average person is 8 hours, it is best to sleep in different days, compared to 7 hours at night and 1 hour at noon. It is related to the fact that if a person is very happy, his sleep quality is high, even if he sleeps a little less, he will not be sleepy, on the contrary, if a person is in a bad mood, very troubled, and sometimes sleepy for a few more hours and still sleepy, please keep a happy mood.

1. Normal people sleep for 6-8 hours (children's sleep time is about 10-12 hours, and babies are longer; Older people sleep slightly less).

2. The time for beauty sleep is 22 o'clock - 2 o'clock in the morning.

3. Staying up late for a long time, even if you sleep for 8 hours, you will be prone to endocrine disorders in a few years, and the biological clock will be messed up.

4. It is best for children to go to bed before 20:30 at night, because of the long body.

5. Teenagers should go to bed around 10 p.m.

6. As for beauty lovers, they must go to bed before 2 a.m., because ** metabolism before 2 a.m.

7. The elderly should sleep between 21 and 22 o'clock at night.

Deep sleep is a part of sleep, accounting for only 25% of the total sleep time, and deep sleep is also known as "** sleep". A person's nighttime sleep is generally divided into 5 to 6 weeks of cycles, with each sleep cycle of about 60 minutes and 90 minutes. Depending on the changes in brain waves, electromyography waves, and eye activity during sleep, the sleep cycle consists of non-REM cycles and REM cycles.

Non-REM sleep is divided into 4 stages: light sleep, light sleep, middle sleep and deep sleep, and then enters the REM sleep period, which is considered the end of one sleep cycle and then continues to start the next sleep cycle.

Generally, adults can maintain a sleep time of about 8 hours, but there is no mandatory requirement for sleep time every day, and it is generally based on their own situation. As long as you are in a good state of mind the next day, you will get enough sleep according to your needs.

People of all ages need different amounts of sleep. Generally, newborns sleep for about 18 hours; Babies are about 12 hours; Preschoolers sleep for about 10 hours; Adolescents sleep for 8-9 hours; 7-8 hours for adults; Older people may have their sleep reduced to about 6 hours due to various functional declines.

People with sleep disorders can drink a glass of warm milk before going to bed, and do appropriate physical exercise during the day to help them fall asleep, improve sleep quality, and ensure that the brain is fully rested.

With enough sleep, nerve cells and memory cells are likely to play their best role. If you don't get enough sleep for a long time and have poor sleep quality, it is easy to cause various health problems, such as mental weakness, sleepiness, malnutrition, etc. Therefore, in order to ensure good health and maintain high efficiency in daily work and study, adequate sleep time should be ensured.

The normal sleep time of people is 7 hours, the sleep time of adolescents is 8-9 hours, and the sleep time of the elderly is shortened accordingly due to physiological factors. The sleep time of the human body varies greatly from person to person, and it is not necessary to be confined to how long the sleep time is, and people who have reduced their sleep time may experience fatigue and poor mental health the next day, because the patient believes that the decrease in sleep will definitely affect the next day's energy. If you have a lot of energy and don't feel sleepy the next day, you don't have to worry too much about the amount of sleep.

A normal person should sleep for 6-8 hours. Everyone has to get a good night's sleep after a busy day. Sleeping is a physiological response, part of the brain's neural activity, and the result of inhibition after nerve cells in the cerebral cortex continue to be excited.

When the inhibitory effect is dominant in the cerebral cortex, the person sleeps.

In life, people have work and rest; In neural activity, there is excitation, and there is inhibition. Inhibition is done to protect nerve cells so that they can be re-excited and people continue to work. Children must sleep for 11 hours per day, 10 hours for elementary school students, 8 hours for junior high school students, and 7 hours for high school students.