Why?

Why oh why does my child decide to get up at 6 am on the only day that I can sleep in?? She even went to bed at 10:30 last night. During the week she goes to bed at about 8:30 and is a bear when I try to wake her up in the mornings. She must have the same "disease" as Eric. He sets his alarm on the weekends to get up early so he feels like his weekends are longer. Why? I love my sleep! To me that is what the weekend is all about :)