Early Risers

It is 7:30 on a cold (-8) and dark Saturday morning. I have already showered but I am still in my robe and one slipper. The girls are ALL up and watching cartoons. Allie and Chrissy have been up since at least 6:30 (that's the time I opened my eyes) and Maggie has been up for at least 20 minutes. They are wide awake and have had something to eat. Why does this only happen on Saturdays and Sundays when they don't have to get up? Why is it such a battle to get them up and moving on school days? I guess it is one of those great mysteries of life right up there with "how many licks does it get to the center of a tootsie pop?" I guess the world will never know.