Who has time for "time off?"

My coffee table now has five teacher books sitting on it, all of which I have begun, but not finished.  I also have three curriculum guides stacked somewhere underneath.
While I LOVE that I have time to delve into all of this, I do worry that all my "preparation" for my first year of teaching kindergarten will wear me out just in time for school to begin.  My youngest asked me today, "Mommy, will you have to work again today?"  Ugh!  The guilt!  BALANCE, BALANCE, where are you, BALANCE?
Anyone else having this same 'problem,' or is this just what we teachers do?  I'd love to hear from you!
Dana