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.
There are reasons, besides pregnancy, for missing a period. it might be that you gained or lost too much weight. Hormonal problems, fatigue, or stress are other possibilities. Some women miss their period when they stop taking birth control pills.