Too little growth hormone can be harmful, and too much can also be harmful. There is a certain range where people can benefit from growth hormone. Individuals who produce an excessive amount of growth hormone in their thirties can develop an enlarged forehead and hands; a condition known as acromegaly. As we grow older, growth hormone levels drop, as does our amount of deep sleep. By taking melatonin, we increase our delta sleep, and generate just the right amount of growth hormone that can be beneficial. The small amount of this hormone produced in adults, due to increased delta sleep, can be beneficial for their health.