If you stay up late when you have your period, you will have the following hazards: 1. It will lead to endocrine disruption, which will cause changes in the amount of menstruation, such as an increase in the amount of menstruation or a sudden decrease in the amount of menstruation. 2. It will cause a feeling of great fatigue, because it is easy to have fatigue and insomnia during the menstrual period, and if you stay up late often enough to get more sleep, it will aggravate the symptoms of fatigue. 3. The reason is that although menstruation is a normal physiological phenomenon, but the body’s hormone levels will change accordingly, if you can not ensure sufficient sleep will cause some damage to the body, so do not stay up late during menstruation and to rest properly.