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.
Some illnesses can cause a woman to miss her period. Thyroid conditions are a prime example, because they often affect the body's hormone balance, which can affect a woman's menstrual cycle. Furthermore, certain medications can also have this effect, especially those that are taken as birth control.