Individuals with psychiatric disorders such as schizophrenia, bipolar disorder, and major depression with psychotic features usually experience insomnia, which can significantly impede with recovery, worsen symptoms, and reduce quality of life. This volume presents a detailed theoretical rationale and session-by-session CBT-Insomnia treatment manual for use with these individuals. 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 program is presented, along with resources offering information on complicating factors, avoiding relapse, managing stress, and restoring lifestyle balance.