Drowsiness during menstruation may be caused by physical weakness. The loss of blood during menstruation can easily cause low body resistance, which requires sleep to replenish body energy. It may be caused by deficiency of qi and blood, which can cause general weakness and panic, etc. You need to go to the hospital for a comprehensive medical checkup and take reasonable herbal medicines to tonify qi and blood under the guidance of a doctor if necessary. Blood loss during menstruation can cause nutritional deficiencies if nutrition is not kept up, which can easily cause soreness and weakness of the waist and knees and insufficient sleep. During menstruation, it is necessary to strengthen dietary nutrition, it is best to eat a diversified diet, not anorexia, partial food, etc. It is recommended to cooperate with appropriate exercise, which can improve the menstrual physique, relieve general weakness, drowsiness, etc. During menstruation, it is necessary to ensure sufficient sleep, not often stay up late, play cell phones, etc.