Most of the sleepiness during the period (medically referred to as menstruation) is normal, and a few are caused by diseases, such as uterine fibroids, adenomyosis, etc., which are not normal. 1. Normal: During women’s menstruation, due to pelvic congestion and elevated levels of prostaglandins, some women can experience gastrointestinal reactions, poor appetite, diarrhea, etc. In addition, due to abnormal neurotransmitters in the body, symptoms such as emotional instability and fatigue can occur. Women can also experience symptoms of drowsiness as their resistance drops due to bleeding during menstruation. 2. Abnormalities: women due to uterine fibroids, adenomyosis, endometrial polyps and other diseases lead to increased menstrual flow, bleeding anemia symptoms, can appear dizziness, fatigue, sleepiness. It is necessary to check the blood routine for hemoglobin. Drowsiness during menstruation, if combined with abnormalities, it is recommended to consult the hospital for examination, identify the cause of the disease, and then follow the doctor’s instructions for treatment.