Mind you this is not really intended as a bed time story for anyone under 18, but bet your asses it is on our nightstand as a quick literary night cap. Here is an excerpt from Adam Mansbach's "Go The Fuck To Sleep" ($9):
The cats nestle close to their kittens now.
The lambs have laid down with the sheep.
You're cozy and warm in your bed, my dear
Please go the fuck to sleep.
Show us a parent who hasn't already published a version of this in their head.