Oxford Reading Tree Explore with Biff, Chip and Kipper: Oxford Level 9: Sleep, Paperback

Why do we need to sleep? What happens when you are asleep? Where do animals sleep? Find out the secrets of sleep. The fiction pair for this title is Wake Up!. Oxford Reading Tree Explore with Biff, Chip and Kipper is a series of paired fiction and non-fiction books to develop children's reading comprehension and foster a love of reading.