In our study of CBT-I, we assigned participants with chronic and primary insomnia to either CBT-I, temazepam, a combination of the two, or placebo. We found that combination therapy was more effective than either treatment alone—in our study, the percentage reduction of time awake after sleep onset was highest for the combined condition (63.5%), followed by CBT (55%), temazepam (46.5%), and placebo (16.9%).

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