On February 9, Zhang Chaoyang, the founder of Sohu, talked about the "four-hour sleep method" in a live talk show, which aroused heated discussions among netizens.

Previously, he had publicly suggested that everyone sleep less, six hours of sleep is best, and four hours of sleep is perfect.

Zhang Chaoyang believes that if you want to sleep deeply and fall asleep quickly, you must first shorten the sleep time and sleep for 4 hours instead of seven or eight hours. After forming a pattern, you can gradually fall asleep quickly.

"I still insist on sleeping four or five hours a day, which is an absolute deep sleep." He said.

　　Is four hours of sleep a day enough?

Applicable to most people?

The reporter interviewed Xu Jiali, Chief Physician of Department of Neurology, Nanjing Benji Hospital with doubts.

Xu Jiali said that sleep is a physiological need, which is affected by personality, personality, occupation, habits, environment and other aspects, and everyone's needs are also different.

"If four or five hours of sleep can really allow you to get enough rest and recovery, it is also possible, but this habit is not suitable for most people, it varies from person to person, and it is not recommended to follow. The best sleep time for adults every day It is best to guarantee seven or eight hours, and long-term lack of sleep may lead to health problems such as low immunity, endocrine disorders, and poor mental state, which need to be paid attention to.”

　　In this live broadcast, Zhang Chaoyang also mentioned many times that his sleep for such a short period of time was deep sleep.

But in Xu Jiali's view, sleep is actually a subjective experience. We cannot accurately judge whether we have deep sleep, but it is more a kind of self-feeling.

"Deep sleep can only be accurately monitored through professional equipment such as EEG. Feeling that you sleep well does not necessarily mean that you sleep deeply. Objective data and actual sleep experience are often not equal."

　　In human sleep, there are about four or five sleep cycles in one night. Non-rapid eye movement sleep (NREM) and rapid eye movement sleep (REM) are interspersed, linked to each other, and repeated.

Some studies believe that NREM sleep is mainly the rest of the cerebral cortex, while in REM sleep, it is mainly the rest of the whole body.

"A simple understanding is that in the sleep of the day and night, the sleep process does not start from light to deep sleep as soon as you fall asleep, and lasts until you wake up the next morning, but alternates between deep and light sleep. At the same time, this has nothing to do with when we fall asleep. Great connection."

　　Xu Jiali suggested that if you want to have a good sleep, you must develop a good sleep rhythm.

Moderate physical exercise can be arranged during the day, and the lunch break should be controlled to about 30 minutes. Try not to eat before going to bed at night, especially strong tea, coffee, cola and other refreshing drinks, and develop the habit of going to bed.

"Lying in bed watching dramas, playing games, etc., will disrupt the formation of our healthy sleep rhythm."

　　Yangtze Evening News/Ziniu News reporter Xu Qianqian