"What exactly happens in your brain while you sleep? A whole lot! And tonight there's plenty going on: Hippo and Campus not only sort out all the new impressions that Malu has collected during the day, but they even help her to find her lost teddy bear! This makes Malu very happy when she wakes up. In a playful and easily understandable style, Anna Russelmann explains why it is so important for children to get enough sleep. The illustrations in watercolor and chalk capture the dreamy atmosphere of the night."-- Provided by publisher.