First the god, My son, who is 2, loved the first pout pout fish book and was so excited to see this. He loves this book and asks for it regularly at bed time.
We had been reading to him, then turning the light out and leaving the room and he would go to sleep shortly after. After the second or 3rd time of reading this book he did not want us to leave him and would scream and chase after us. I asked what was wrong and he said "Scared" which really was not something he had ever said or used before this book. I don't blame this book in a negative way but I think it just introduce the idea that the dark might have something worth being afraid of. No we read till he falls asleep. No big deal.