My dad calls it payback. I call it, an inconsiderate three year old vs. a tired mommy.
My son is of the belief that Saturdays and Sundays are the days you get up before dawn and wake up everyone in the house. He is also of the belief that Mondays through Fridays, the days when he is required to wake up before dawn, you should scream, cry and be very unpleasant when your mother drags you out of bed.
It doesn't matter that Sunday morning you woke at 6a.m. without prompting and Monday morning it is 6:30a.m. when Mommy is attempting to wake you up. It also doesn't matter that Sunday you could have slept at least another two hours or that you went to bed early Sunday night in order to wake up early Monday morning.
There is no proof that getting up at 6a.m. on a Saturday morning constitutes the right to wake up Mommy by hitting her and yelling, "WAKE UP!"
There is proof that your Daddy is an insomniac so you need to go downstairs and find him because he's wide awake. Your mommy is sleeping. Leave her alone!
This early-riser-weekenditis behavior has nothing to do with the fact that your mommy did this same thing to her parents as a child. Right? If it does have something to do with it, I can only hope that you have a little three year old who does the same thing to you.
Payback, it's what parenting is made of.