Teenagers sleeping leg cramps at night mainly consider the following reasons: 1, cramps due to cold legs, children sleep sometimes have the habit of kicking the quilt, the room temperature at night is relatively low, if the limbs are not adequately warm cover will lead to muscle cold cramps; 2, due to the rapid growth and development of adolescents, when the nutritional deficiency, especially calcium ions, trace elements, these nutrients are insufficient when it will This can lead to muscle dysfunction and cramps; 3. The accumulation of metabolic products is seen in adolescents due to the large amount of exercise during the day, and at night when they sleep, the local blood circulation slows down and the metabolic products stimulate cramps, mainly in the above cases.