What are the historical foundations of Insomnia and what precisely is meant by the Insomnia Disorder? How can we explain behavioural patterns of people with Insomnia, young or old, and what are the major theoretical bases for understanding these? What is the latest thinking regarding diagnosis, and what are the most effective strategies for assessment, education and care for people with this condition? Following on from Malcolm King’s book An overview of the Insomnia Disorder, It answers these questions with the latest research on Insomnia spectrum disorders. Already popular as an introductory text for those wanting to know more about Insomnia as well as a source of basic information and references for those familiar with the field, this newly updated and enhanced book is invaluable for students, professionals and even families.