The price you pay for oversleeping. You sleep so late that you have to buy breakfast on the way to work/school. Sometimes it's a cost/benefit equation: Is sleeping late worth the price of breakfast at a drive-through restaurant?
Q: Yo man! Why you so broke?
A: Ahh man, these late nights at the club are killing me! I've had to pay sleep tax three times this week. I'm sure getting tired of Mickey Dee's sausage muffins and hashbrowns.