Overcoming Insomnia Therapist Guide: A Cognitive-Behavioral Therapy ApproachIt is estimated that one in ten U. S. adults suffers from chronic insomnia. If left untreated, chronic insomnia reduces quality of life and increases risk for psychiatric and medical disease, especially depression and anxiety. There are two forms of insomnia: secondary insomnia, in which it is comorbid with another condition such as psychiatric disorders, chronic pain conditions, or cardiopulmonary disorders, and primary insomnia, which does not