Leg cramps are a common and most of the time a condition which is not causing any harm. In this situation the muscles in the legs suddenly start feeling tight and painful. Most of the time it happens when folks are asleep. The pain appears in the calf or in the thighs and feet. In the course of the night folks get off the bed and the pain goes on for a couple of seconds or minutes. There are cases in which the pain vanishes quickly, however the pain in the muscles can last the rest of the night.