Coco and i were discussing this, just before my departure, and that there isn't much stock to be taken in it. That is, the idea that one can accrue a debt by losing sleep that literally needs to be paid back before one can return to optimal health. So that all-nighter you pulled in grade 11 might still be weighing heavily on your immune system or psychological well-being.
But imagine. Imagine if this were true.
stef: "Come out with us, tonight, Coco, we are going to have some wine!"
Coco: "I'm afraid I can't, I'm very very busy."
stef: "What about later in the week, then?"
Coco: "No No, I'm sorry. I've got a great deal of sleep to catch up on; i'll be sleeping around the clock for the next five days."