I am always like that the day before the first day of school....and it is ALWAYS my kid's best night sleep since summer. My first grader (who routinely wakes around 7:30 in the summer slept until 8:30! this morning) and preschooler until 8am. The preschooler even stayed in his own bed.
WE always joke that our kids like to sleep in on school days and get up early on 'fun, stay-at-home days'.
My youngest starts K next year and I already am welling up...neighbors youngest started K today and when they called her class in this morning--I cried for her

! Even though mama took it in stride.
First days always are a big reminder how much older my kids are getting each year. My sister had her first go off to college two weeks ago...I can't even think about that!