Taking melatonin daily will not cause infertility in women. Melatonin can help with sleep and regulate immune function, but for women around 30 years old experiencing poor sleep, it should not be taken frequently. Since it is a hormonal medication, long-term use can not only have adverse effects on the body but also lead to dependency. During this period, women should ensure proper rest, engage in appropriate daytime activities, and maintain a regular lifestyle to help improve sleep quality. Additionally, maintaining a good mood is important. If you feel particularly depressed, it is advisable to consult a psychologist.