Sleep plays a critical role in human growth, especially during childhood and adolescence. The commonly held belief that “sleeping early helps you grow taller” isn't just folklore—it has biological backing. During deep sleep stages, the body releases the highest levels of growth hormone (GH), specifically human growth hormone (HGH), which directly influences the development of bones and muscles. This hormone is secreted by the pituitary gland, and its release is closely tied to circadian rhythms and the onset of slow-wave sleep, which predominantly occurs during early nighttime hours. Inadequate or delayed sleep disrupts this cycle, potentially minimizing HGH release during key growth periods.