how come children have no sense of urgency?

I have three kids and it has recently occurred to me that my children have no sense of urgency. No matter how much of a hurry I am in, they seem to move at the same speed. Actually, I think if I mention I am in a hurry, they may even move slower.
This thought is in conjunction with the fact that these are the same children who I cant seem to wake up for the life of me from Monday to Friday; however when Saturday morning comes along, the first in which I can sleep in past six, they mysteriously get the urge to become morning people. Morning people with the urge to wake up around 5:45-6:00. It is incomprehensible to me that I am forced to get up at 6 on weekdays, and when I get to sleep in, I somehow am forced to get up earlier.