Ovulation-promoting medications are not always taken at night. In most cases, doctors recommend that patients take ovulation-promoting drugs at night for two main reasons: first, if ovulation-promoting drugs are taken at night, the patient is more likely to ovulate at night. Because a woman’s egg has the highest chance of conception within the first six hours after ovulation, if the patient has intercourse at night after ovulation, she will not miss the time when the egg is of the highest quality to conceive. If the patient takes it in the morning and ovulation occurs without intercourse, the quality of the eggs will decrease when intercourse occurs in the evening and the woman’s chance of conception will be reduced. Secondly, if the patient uses ovulation medication continuously, it is better to use it at night for the continuity of treatment. This is because during the day, due to work or many things, it is easy to miss the dose, so that the hormone level in the body is unstable and the follicle development is not ideal.