why am I up so early?

It's 6:15 on Saturday morning.  And I'm awake.  Bleh.  I have been waking up early a lot lately.  But I've been exhausted every time and don't want to wake up.  Maybe its because I was so stressed about report cards and end of the year stuff.  Maybe now it's because there is so much to do this weekend that my mind wants to get started.  Maybe its because I'm so excited that in less than a week we close on our new house.  I dunno, but I wish my brain would let me sleep in at least one day!