It is during deep sleep that growth hormone does its job to thickening and lengthening your bones to make you grow taller. So appropriate sleeping time (not the longer, the better) and correct sleeping posture is very important for you to grow taller. Sleep is defined as a natural periodic state of rest for the mind and body, in which the eyes usually close and consciousness is completely or partially lost. Hence, that there is a decrease in bodily movement and responsiveness to external stimuli.

During deep sleep, growth hormone produced by your pituitary gland is released into your blood stream. It travels through your body and causes the thickening and lengthening of your bones which can help increase your height. Therefore, you should achieve "deep level" sleep on a daily basis in order to coordinate your exercise efforts and proper diet to increase your chances of growing taller.