The reasons for the aches and pains are as follows: 1. The cold virus may be caused by the cold, and the metabolites formed by the virus will accumulate in the limbs to produce stimulation, which will lead to aches and pains the next day. 2. The cold at night when sleeping, such as opening the air conditioner, fan, and not covered, will lead to the muscle tissue of the limbs to present a cold state, and after the cold, the muscles will become relatively tight. The inflammatory stimulating factors and metabolites of lactic acid accumulate in the body and cause aches and pains after waking up the next day. 3, inflammatory lesions are formed due to overwork during the day, and after sleeping, the blood circulation is slower during sleep, resulting in serious accumulation, stimulating the peripheral nerves and causing obvious pain, and the accumulation of lactic acid also produces stimulation, causing the body to be in a feverish state. The accumulation of lactic acid will also produce stimulation, resulting in the body in a state of acidity, so there will be the symptom of sleeping with body aches.