The essential guide to teenage behaviour that every parent, teacher and teenager should read! From an award-winning author and expert on the teenage brain, this reassuring book answers the questions every parent and teenager wants to know. Why do teens spend so much time on their phones? Why do they sleep late? And why do they take so many risks? This bestselling classic is packed with explanations, advice and quizzes, and has been recommended by teachers, parents and social workers for 20 years. Covering topics including emotions, sleep, social media and mental health, this fully updated edition is easy to read and backed by scientific research. It will help parents understand teens - and help teens to understand themselves. "a must read for parents and teachers" - The Scotsman "Nicola Morgan has that rare gift of being able to communicate science and make it fun" - Professor Simon Baron-Cohen "I only wish that this book had been around when dealing with my own teenager's antisocial behaviour" - TES