Is Insomnia Caused by Mental Illness?

Insomnia is a common condition affecting individuals of various ages. It is diagnosed on the basis of a self-reported complaint of poor sleep quality concomitant with daytime disturbances. If left untreated, insomnia is associated with a number of adverse health outcomes (N. Grima, 2019). Insomnia is a common and treatable disorder that can have serious daytime consequences, including fatigue, memory impairment, and impaired quality of life. It is often associated with other conditions such as pain, depression, anxiety, and substance dependence. The disorder is characterized by over-engaged arousal systems, leading to increased metabolic rate, body temperature, and heart rate (Roth, 2007).