Sleeping up with body aches and pains is mainly due to three reasons: 1. The most common is that during the day, due to more physical activity in the limbs, resulting in muscle exertion resulting in greater muscle tissue strain, the formation of inflammatory lesions. During the time of activity, the blood circulation is faster, so there will not be a serious chase, pain is not obvious, but after sleeping up, due to the sleep process in the blood circulation is slower, which will lead to the accumulation of inflammation. The pain is more obvious due to the stimulation of peripheral nerves, and the accumulation of lactic acid will also produce stimulation, leading to acidity in the body, so the feeling of soreness will appear. 2, due to cold conditions during sleep at night, such as open air conditioning, fans or door and window convection, as well as the lack of clothing to cover, will lead to the muscle tissue of the limbs showing a cold state. Once the cold, the muscles will become more tense, also prone to excessive fatigue, inflammation and metabolites such as lactic acid, will appear the next day after waking up sore feeling. 3, there may be a viral infection, such as influenza, which will lead to the cold virus and the metabolites formed by the virus will stimulate the body’s muscles and joints and other tissues, it is easy to appear sore feeling. The feeling of soreness.