Individuals with psychiatric disorders such as schizophrenia, bipolar disorder, and post-traumatic stress disorder often report Insomnia and difficulties sleeping which can significantly impede recovery, worsen symptoms, and reduce quality of life. This volume presents a detailed theoretical rationale and session-by-session outline for delivering Cognitive Behaviour Therapy for Insomnia to people with these mental health disorders.The treatment has been developed in close collaboration with people living with mental illness, as well as sleep specialists and psychosis experts. Information regarding the efficacy of the programme is presented, along with resources offering information on complicating factors, avoiding relapse, managing stress, and restoring lifestyle balance.