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Insomnia Severity Index. Nos. per study arm at beginning of intervention, postintervention, and follow-up were as follows: cognitive behavioral therapy for insomnia (CBT-I) plus placebo, 21, 18, and 16; CBT-I plus armodafinil, 22, 17, and 16; placebo, 22, 17, and 19; and armodafinil, 23, 15, and 14, respectively. (*) P values indicate difference from placebo using analysis of covariance, with multiple imputation and controlling for values at time of consent.
