Taking melatonin for insomnia has some effect. Melatonin can be used to treat mild insomnia. This is because melatonin is a physiological hormone that is already present in the body, and its secretion is directly related to the body’s circadian rhythm, which can improve the quality of sleep, reduce the number of awakenings during sleep, and prolong the stages of deep sleep. It can have a decrease in wakefulness threshold when waking up in the morning and can help adjust the sleep rhythm, especially for patients with jet lag insomnia. It is recommended to use melatonin under medical supervision when ingesting it to prevent other side effects in case of overdose. It is important to note that melatonin can only improve mild insomnia, but is not effective for moderate and severe insomnia, which requires a visit to a regular hospital, neurology or psychiatry department, where anxiolytic, antidepressant or benzodiazepine or non-benzodiazepine sleeping medications can be given after a thorough examination.