Zachary is a small tiger-person who becomes obstreperous at bedtime. His parents are understandably near the end of their patience when Zachary suggests turning the tables: he will put them to bed instead. Instead of scolding, he decides to be a ""good"" parent and let them stay up late, watch TV, hear a story, and have a snack; but all his parents want to do is go to bed. Then another switch: everybody decides to be ""bad""--Zachary is peremptory and his parents are uproarious, till they all fail asleep. The moral is obvious, perhaps directed more at parents than at children. Blaustein's boldly sketched, cartoon-like illustrations are splashed with bright colors; they depict lively action in a middle-class house apparently in the Southwest, judging from Mr. Tiger's ten-gallon hat and the palms and cactus found in the yard. Acceptable; appropriate for picture-book hour, but not outstanding.