There are several reasons why fractures are particularly painful at night: First, the pain threshold decreases at night, that is, the sensitivity of people to pain rises at night, resulting in great sensitivity to pain, so they feel particularly painful. Second, lying still at night slows down blood circulation, bruises accumulate at the fracture site, inflammatory cells increase, and inflammatory and pain-causing substances accumulate to stimulate the nerve endings, making the pain worse. Third, late at night, people’s attention is more concentrated and they tend to be very sensitive to the pain of the fracture site, so they feel especially painful at night, and the pain can be reduced by someone talking or distracted by murmurs during the day.