Dizziness after taking melatonin is considered to be caused by adverse effects of melatonin. This is because a small number of people will experience transient dizziness and nausea after taking melatonin, patients should not be too nervous, after stopping the medication, this situation will soon disappear on its own. Melatonin is a hormone that exists in the human body and is produced by the human pineal gland as an amine hormone, so it can have some effect on sleep. Melatonin has an anti-aging effect in the body, and it can also improve the patient’s sleep by significantly reducing the number of awakenings during sleep, reducing the duration of light sleep and extending the duration of deep sleep, and also has a certain regulatory effect on endocrine secretion. It is also believed that melatonin can improve one’s immune system and can enhance one’s physical fitness. However, it is not clinically recommended that patients take melatonin for a long time to improve sleep, because although melatonin can improve insomnia, if taken in excess, it can still lead to endocrine disruption and other problems, and long-term use of melatonin is likely to produce a certain dependence on this substance, once not eaten may be more serious insomnia.