How long does a person need to sleep? Different age groups are different. The most common sleep demand of adults is 7-8 hours. Generally speaking, newborns sleep no less than 20 hours a day; The baby is about 15 hours; School-age children are about 10 hour; 8 hours for adults; 5 ~ 6 hours for the elderly.
The quality of sleep can be measured by five criteria:?
(1) fall asleep quickly and fall asleep within 30 minutes.
(2) deep sleep, not easy to wake up.
(3) I don't wake up at night or rarely wake up, and I don't dream. I soon forget my dreams after waking up.
(4) Get up quickly, and get up in the morning with good spirits.
(5) clear-headed, energetic, efficient, and not sleepy during the day.
Extended data:
Scientific research shows that the best sleep time is 2 1 to 5: 00 the next day. In real life, it is recommended to go to bed before 22: 30, go to bed at 23: 00 and get up at around 7: 30 the next day.
This is because the human body produces energy during the day (5: 00-2 1) and starts cell division at night (2 1- 5:00 the next day) to convert energy into new cells. It's time for human cells to recuperate and innovate. That is, people rotate with the earth to the side facing away from the sun, and the yin is quiet, which is a good time for people to sleep. Only by resting at this time can they have a good state of mind and body.
This situation is actually similar to plants-farmers say that "crops can be heard jointing at night" because plants absorb solar energy during the day and grow at night; Human and plant cells divide at roughly the same time. If you miss the good opportunity to sleep at night, cell regeneration will be far behind death, and people will get old or get sick prematurely.
After a long evolutionary process, human beings have actually formed a biological clock to regulate sleep and awakening, which is consistent with the rhythm of the external environment. If you work overtime all night, surf the Internet, play cards and have fun, and disturb your biological clock, the result of staying up late is often that you can't wake up. Even if you lie in bed and sleep late, that day will be dizzy.
People's Network-The best time to fall asleep: 165438+ 0: 00 pm.