After the ankle sprain, whether it leads to ligament damage or fractures can appear more painful at night than during the day, mainly for the following reasons: first, some minor ligament sprains do not pay attention to the day, there are also down to walk or strenuous exercise, which can easily lead to the sprained part of the condition aggravated, of course, the pain will be more obvious at night than during the day. The second, the night compared to the daytime temperature to be low, humidity, there is the influence of the surrounding environment can also cause pain changes. The third, compared to the day and night the surrounding environment to quiet, there is pain stimulation and their own psychological role, thinking about how the pain should be resolved, equivalent to a psychological implication, will also cause further aggravation of pain than during the day. This is a normal change in the early stages of this disease, so there is no need to worry about it.