The aim of this paper is to present Cognitive Behavioural Therapy for insomnia with modifications included in the group of the elderly and to present a review of research on its effectiveness. First, diagnostic criteria for insomnia and the concurrent disorders are presented, followed by a characterisation of insomnia in the elderly, stressing age related differences. Models explaining the etiology and persistence of insomnia are also shown. Further, cognitive and behavioural techniques used in insomnia treatment are described e.g. Sleep Hygiene, Stimulus Control Instructions, Sleep Restriction Therapy. Next, the author describes modifications to the classic therapeutic techniques used in insomnia therapy in the elderly, accounting for general health condition, cognitive potential, lifestyle and living conditions as well as social factors. The final section discusses the results of the studies on the effectiveness of Cognitive Behavioural Therapy for insomnia in the group of seniors and patients with insomnia that is concurrent with other conditions. The presented literature review indicates that although it often requires modifications, the Cognitive Behavioural Therapy for Insomnia provides an effective form of therapy for a range of age groups, including the elderly.