Call her bluff

"Alright," you shrug, "I won't count this as a strike, but we'll see how long this lasts. Don't forget that you still have work tomorrow!"

"Yeah, I know..." you can't tell whether you hear just a hint of hesitation in Kristen's voice.

You don't see her much for the rest of the day, but as you two retire for bed you see she's still naked, not wearing the pajamas she usually wears. Whatever, you shrug smugly thinking of seeing her break her word in the morning.