Why does it happen ONLY on a Sunday morning!

I loooooooooooooove it when Ghadi wakes up at 6:00 on a Sunday morning (And I have to mention that it happens ONLY on a Sunday morning! any other morning we should have a fight to wake up at 6:00)
BUT on Sundays, and for a mysterious law of nature, he wakes up all alone, full of energy and he comes and join us in our bed...
Then he starts rolling over, I bet him for a hug and he surrenders and gives me a 2 seconds hug!
He turns to his father and try to wake him up...
then he hides under the covers and plays the fish and shark game with us... (he is the fish, and evidently Jamil is the big shark who should find the fish, then EAT it!