Trees Provide Habitat for Wildlife. It is only natural that wherever trees are planted, wildlife and other plants are sure to follow. Trees provide shelter and food for a variety of birds and small animals, such as squirrels and beavers.
The only real medical reason you could be unusually tired during your period is if you have anemia, which is an iron deficiency. For some women who are anemic and have a very heavy period, the first day can be a doozy. However, this group is in the minority.
1 You start to feel nauseous due to period pain. You experience menstrual cramps in the uterus due to certain chemicals, including prostaglandins that lead to muscle spasm. This can lead to discomfort and nausea.  You may experience nausea due to other pain associated with PMS such as menstrual headaches or breast pain.