Keeping in good health at twelve o'clock can make free use of time. Many people really can't keep fit at twelve o'clock. Mainly because, many times in life, the arrangement of time is not something you can decide. However, paying attention to twelve o'clock health preservation is of great significance to human health. For example, at night 1:00~3:00 is the circulation time of qi and blood in the liver meridian of foot yin deficiency. At this time, people need to stay in bed. When a person lies in the clouds, blood will return to the liver. This is the best time to replenish blood, nourish liver and sleep. If you stay up late and don't sleep. Liver, no rest. Qi and blood cannot return to the liver. It will cause liver problems over time.