Children's height and growth hormone secretion is closely related to the secretion of growth hormone mainly at night, adequate sleep can protect the normal secretion of growth hormone. Adequate sleep, good quality of sleep, the growth of children is very important. Children usually study pressure, sleep late enough, often lack of sleep, easily lead to lack of growth hormone secretion. During the winter vacation, parents should ensure that children have 9 to 10 hours of sleep a day, do not stay up all night playing games, surfing the Internet, watching TV. Kids can play and train with inflatable gymnastic mats.