During the day, the boy has been to the zoo where he has seen a lion and her cub. As nighttime falls, the boy and his father share a book. It's the boy's bedtime, but the boy is not sleepy. He is still with the lions. "Sleepy Boy" is a lovely hymn from a new author -- a hymn to day and to night, to awake and to asleep, to mother and child, to father and son.