Melatonin may help some kids sleep—but experts warn the popular “natural” sleep aid may not be as harmless as many families think. Credit: Shutterstock Melatonin has quickly become one of the most widely used sleep aids for children around the world. Its popularity is largely driven by the belief that it is a natural and easily accessible solution for insomnia. However, new research suggests that its rapid growth in use has moved faster than the scientific understanding of how safe and