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 This can be a sign that you may have a hormone imbalance or a problem with nutrition.  You have very heavy or long periods, or get your period more often than every 21 days. Losing a lot of blood can cause anemia (low blood levels) and leave you feeling really weak and tired.