Download or read book What Happens While You Sleep written by Anna Russelmann and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: What exactly happens in your brain while you sleep? A whole lot! When Malu goes to sleep, Hippo and Campus not only sort out all the new impressions that Malu has collected during the day, but they even help her find her lost teddy bear! This makes Malu very happy when she wakes up.