Insomnia overview: epidemiology, pathophysiology, diagnosis and monitoring, and nonpharmacologic therapy.

Insomnia, whether short-term or chronic, is a common condition. It has a negative impact on vulnerable patient groups, including active military personnel and veterans, patients with coexisting psychiatric and medical disorders, those in life transitions such as menopause, and elderly persons. Although cognitive behavioral therapy for insomnia (CBTI) is first-line treatment for insomnia, its high cost and a lack of trained providers has prevented widespread uptake. Now, digital CBTI (dCBTI) is emerging as a scalable option with the potential to overcome these barriers in managed care. The first part of this article reviews the epidemiology and pathophysiology of insomnia with a focus on vulnerable patient groups. The second part explores the rapidly evolving landscape of nondrug therapy for insomnia. The underlying concepts and supporting evidence for CBTI and dCBTI are presented, including their utility in vulnerable patient groups.