Some nights i wake up because of suddlen leg muscle pain. really painful and every episode can last days. i wake up some nights because of this. ?

See your doctor.: Muscles cramps may result from overuse, dehydration, mineral imbalance, muscle strain, buildup of toxins, a disorder involving the nerve to the muscle, and lack of adequate blood supply to the muscle. In many cases, however, the exact cause of a muscle cramp isn't discovered. See your doctor to diagnose and treat recurrent cramps. Best of health to you!