The body aches in the second half of the night, mainly because the temperature drops in the second half of the night, resulting in a state of cold, affecting the normal blood circulation of the body, the circulation will lead to an increase in the metabolites produced by the body, the accumulation, easy to appear the symptoms of body aches. In the daytime, due to strenuous exercise leads to the body’s muscles, ligaments and other soft tissues show excessive fatigue and easy to form strain injury, in the process of activity will not appear obvious pain, because the blood circulation is better when the activity, metabolites can be metabolized in a timely and effective way, so the symptoms are not obvious. When resting, especially in the second half of the night, the blood circulation decreases, resulting in an increase in the metabolites of the strain, which can easily lead to painful symptoms. If a viral infection occurs at night when you are cold, such as an upper respiratory infection, there will be a virus and the metabolites produced by the virus to stimulate the peripheral nerves of the whole body, and the symptoms of body pain will appear, mainly body aches and pains.