Melatonin, a natural hormone produced by the body's pineal gland, has gained widespread attention for its ability to regulate sleep-wake cycles and adjust the body's internal clock. It is commonly used to treat jet lag and shift-work disorder, and to help blind individuals establish a regular day and night cycle. Beyond its primary use for sleep-related disorders, melatonin has been shown to be effective in treating a wide range of other conditions, including insomnia, rapid eye movement sleep behavior disorder, attention deficit-hyperactivity disorder, high blood pressure, developmental disorders in children, and sleep problems associated with benzodiazepine withdrawal and smoking cessation.