The psychological intervention for insomnia disorder that has been used to treat it most successfully is ________ therapy.

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Cognitive-behavioural therapy (CBT) is the most effective psychological intervention for insomnia disorder. It focuses on changing people's negative thoughts and beliefs about sleep and improving sleep-related behaviours. CBT is often combined with sleep hygiene education, relaxation techniques, and stimulus control to improve sleep quality and duration. Psychodynamic, humanistic, and Gestalt therapies are not commonly used to treat insomnia disorder.

The Psychological Intervention for Insomnia Disorder That Has Been Used