'What story would you like tonight?' asked her mummy. 'Can I have the story of the hedgehog family, please?' This was one of Tilly's favorite stories. As her mummy read the story, Tilly gradually drifted off to sleep. Her mummy smiled after putting the book on the floor, leaning it against the dressing table, and crept out of the room. She couldn't remember the last time that they had reached the end of the story. 'Hey sleepy head, wake up. We need...