"Lull-a-bye, Lull-a-bye, little one, Dinner's over, bedtime's begun." With these words, a mother and father start the night-time ritual of putting a toddler to sleep. There's "splash-a- bye" time in the bathtub with rubber-duck squeaks and bubble-beard cheeks; "rock-a-bye" time where the whole family sings silly songs together; "hush-a-bye" time with Dad reading and the moon watching from high above; and finally, "Lull-a-bye" time again, as the child...