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The physiological cycle of human sleep is 1.5 hours.
According to the physiological cycle of human body, 0-3 am every day is the deep sleep time and the best sleep time. No one should delay this three-hour golden sleep period. This means that people should go to bed at 22:00-22:30, and then be in a deep sleep state at 0-3 am. After many people fall into a deep sleep, they can't move and can't hear the sound of knocking at the door. This is also an important reason for the highest incidence rate in the three hours in the morning.

Medical research shows that the peak period of growth hormone secretion and the most active time of human epidermal cell metabolism are between 0-3 am. Not sleeping at this time is an act of inhibiting physical growth for children during their growth and development; Insomnia at this time will affect the speed of cell regeneration, leading to skin aging. The consequences of this horror will be directly reflected in the faces of ladies. If children want to grow taller and women want to keep their facial skin good, they must get into the habit of falling asleep around 22: 30, preferably at 0-3 am. As the old saying goes, "When a person is ugly, the eaves are three inches shorter", which means that at midnight 1-3 o'clock, everything is quiet, naturally quiet, and even the eaves hang down three inches lazily to "sleep", especially for people.