Current research has found that melatonin has the ability to improve sleep quality and prevent insomnia, but it can also bring about complications if used irregularly and in high doses, such as daytime drowsiness, dizziness, and headaches. In addition melatonin may also stimulate the abdomen and cause abdominal discomfort, while melatonin may also cause mild anxiety, irritability, and allergies, as well as disordered thinking and a persistent feeling of mental depression. In addition, current studies have not confirmed the effects of melatonin in infants and children, so we believe that for infants and children melatonin is still experimental. In addition, there are some reports that high doses of melatonin can affect ovulation and enhance the difficulty of pregnancy, so it is believed that melatonin may have some degree of mental effects, so after taking melatonin for some activities that require a high degree of sensitivity and motor coordination should be avoided.