sleep credit

The false belief that you can somehow "pay yourself forward" for an upcoming real or potential lack of sleep.

"Won't you be tired staying up all night?"

"Naw, I slept in till the crack of noon. I got sleep credit"

"Sleep credit? Man, that's not real! Sleep isn't an iTunes gift card. You can't save up extra sleep and cash it in at a later date"

"yeah huh I can"

"You're stupid, sleep for 16 hours straight and then stay up for 48 hours in a row and let me know how that sleep credit works out for you."