Worn smack dab out!

Man!  I just started subbing (yesterday 3rd grade and today 1st grade) and I am literally worn out!  (Doesn't help that I have a little cold.)  I now know how hard it is going to be being a teacher.  The little kids are cute and all, but I can only teach grades 4-8.  That being said, I now believe I am switching from the 4/5 grade level to wanting to teach the 7/8 grade level.  I need a little more organization than the chaos of the little ones.  Of course, I need to sub a 7th or 8th grade class first to know the truth.  It just has to be a tad better. We'll see! :)