The biological clock is actually the inherent law of human activities. If this rule is broken, it will lead to physical problems. The four typical characteristics of biological clock are reminding time, reminding events, maintaining state and forbidding function.

The disorder of biological clock will cause the disorder of human activities, causing insomnia, anxiety, forgetfulness, endocrine disorders and decreased immunity. The longer the disorder, the more serious the decline of immunity, which will eventually lead to various diseases. If you stay in hospital for three days and take medicine at both ends, your life will be shortened.