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PubMed, PsycINFO, and Social Science Citation Index (1966–2004); the Cochrane Controlled Trials Register; and reference lists.
Study selection and assessment:
randomised controlled trials (RCTs) that were published in English language, peer reviewed journals; enrolled adults with a diagnosis of primary insomnia; included ⩾1 cognitive behaviour therapy intervention; included ⩾1 of 5 sleep outcomes; and reported data that were …
For correspondence: Dr M R Irwin, UCLA Neuropsychiatric Institute, Los Angeles, CA, USA.
Sources of funding: in part, General Clinical Research Centers Program and the Cousins Center for Psychoneuroimmunology.