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Randomized controlled trials (RCTs), which compared the CBT-I group with a control group in patients with sleep disorders, were identified. The high prevalence of sleep disorders and the limited number of trained practitioners have driven the development of alternative delivery methods for lower-intensity CBT-I. However, the question remains as to what extent insomnia patients, in fact those treated with drugs, would benefit from the GCBT. When looking at continuous variables, years of diagnosis of sleep disorders were inversely related to improvements in sleep efficiency, wax after falling asleep, and overall sleep time.