Why It's Time to Go to Sleep

The bath is done, the milk is finished, the storybook has been closed. It's time to go to sleep. The atmosphere of coziness and contentedness is shattered with a single question and the tantrum that goes with it: WHY?

Of course, there's the patient, child-friendly response that is usually given every night when this question comes up, but tonight Mama is just too exhausted to play that game. She needs some wine. She needs to wash the dishes and tidy the house. She needs some uninterrupted time alone with her partner, if you know what I mean.
Why is it time to go to sleep? The real answer might surprise you.