Sleep is an indispensable physiological phenomenon for human beings. Sleep quality is closely related to human health. Sleep accounts for nearly 1/3 of a person's life. From the perspective of natural science, it is best to sleep until you wake up naturally, but some people don't think so.
Recently, Sohu CEO Zhang Chaoyang said in the live broadcast that everyone had better sleep for 6 hours. It would be perfect if you could sleep for four hours. Zhang Chaoyang said: "In the first two hours of sleep, it is a deep sleep. After two and a half hours and three hours, the brain began to have all kinds of nightmares. In the process of nightmare, there is no reason to control it, it will continue to enlarge.
So the reason why we often can't sleep well is because after sleeping for three hours, we spend the next three or four hours in nightmares, and it will be particularly uncomfortable after getting up.