Good sleep depends on sleep time and sleep quality, for normal adults, only 6 hours of sleep per day, if you can ensure the quality of sleep, deep sleep time is sufficient to meet the normal physiological needs, will not affect the health, there is no question of how long it can last. However, for children and adolescents, or people who cannot guarantee 6 hours of sleep quality, sleeping only 6 hours a day may not be good for health in the long run, and some people may not be able to hold on for several days, and may also cause adverse effects on the digestive system, nervous system, circulatory system and endocrine system, etc. The normal growth and development of children and adolescents may also be affected. 1. Digestive system: only 6 hours of sleep a day Sleeping for only 6 hours a day may affect the normal function of the digestive system if the quality of sleep is not guaranteed, leading to loss of appetite, nausea and other uncomfortable symptoms. In the long run, it may also increase the risk of gastric ulcers; 2, the nervous system: only 6 hours of sleep a day, if you can not meet the needs of the normal body, may affect the nervous system, after a few days may appear in the daytime concentration, easy fatigue, dizziness, headaches and other abnormal symptoms of the nervous system, serious cases can affect the normal brain function; 3, the circulatory system: only 6 hours of sleep a day, may Will lead to the body’s circulatory system can not work properly, the blood circulation system will also be affected, may increase the risk of hypertension, cardiovascular disease; 4, endocrine system: only 6 hours of sleep a day, may lead to the body’s endocrine system metabolic disorders, easy to cause weight gain, skin deterioration, etc., but also easy to lead to mouth ulcers, acne and other diseases. In addition, only 6 hours of sleep a day, sleep needs can not be met, may also lead to anxiety, depression and other mental symptoms, which can lead to psychological disorders, affecting life.