Insomnia is one of the most common sleep disorders, affecting the quality of life of millions of people. The prevalence among adults ranges from 10 to 30%. Given the importance of adequate sleep for health, the need for intervention in the treatment of insomnia is increasing. Cognitive-behavioral therapy for insomnia (CBT-I) has proven to be a first-line treatment for insomnia, outperforming traditional pharmacotherapy in terms of effectiveness and sustainability of results. Purpose. Summary and systematization of modern research on the role of CBT-B in the treatment of insomnia, analysis of its effects, advantages and limitations, as well as assessment of its place in the management strategy of patients with sleep disorders. Data search was carried out in leading scientific databases from 2015 to 2025, including original studies and systematic reviews studying the effectiveness of CBT-B and its impact on sleep quality, anxiety and depression. Special attention is paid to the psychological aspect of CBT-B, with an explanation of the psychology of the process. Conclusions: modern research confirms the high effectiveness of CBT-B, making it the preferred method for patients of all age groups.