In early pregnancy, the condition of sore legs while sleeping at night may be an early pregnancy reaction. Some pregnant women may also experience gastrointestinal symptoms such as nausea and vomiting. If you have sore legs when you sleep at night, it may be caused by overexertion, such as prolonged physical labor during the day may cause lactic acid accumulation in the leg muscles, which may also lead to sore legs. Women in the early stages of pregnancy may also have varicose veins in the lower extremities and other diseases, due to poor venous return in the lower extremities, patients may also have symptoms of soreness and swelling in the legs. In addition, patients suffering from lumbar disc herniation and other diseases may also experience discomfort in the lower back, as well as soreness and pain in the legs. So this situation needs to pay attention to rest, avoid strain, can be appropriate heat compress on the legs to promote local blood circulation, relieve the symptoms of leg pain and swelling.