Knee pain at night in young people may be due to more intense exercise during the day, if there are no other causes and no other pathological conditions, the pain will be normal. One is that too much, too intense, too long exercise during the day may cause an irritating reaction in the joints and bones when sleeping at night, with parasympathetic excitement and stronger pain, and the pain is a little more pronounced at night. In this case, rest for a few days, or through a period of hot compresses, relaxation of muscles, generally can improve. If it does not improve and the symptoms persist, it is recommended to seek medical attention to see if there are any other pathological conditions, such as arthritis, nerve pressure causing neuralgia, or lower limb disorders related to vascular disease.