♦ Colin Espie. Overcoming Insomnia and Sleep Problems (London, Constable & Robinson, 2006)

♦ Michael Perlis, Mark Aloia and Brett Kuhn. Behavioural Treatments for Sleep Disorders (London, Elsevier, 2011)

♦ Dennis Greenberg and Christine Padesky. Mind over Mood: A Cognitive Treatment Manual for

♦ Clients (New York, Glford Press, 1995)