Previous studies have suggested that there is a reciprocal relationship between anxiety/depression and insomnia. However, little is known about the prospective relationships between these constructs across the course of cognitive behavioral therapy (CBT). The aim of the study was to examine these relationships in clients who received short-term CBT in a primary care setting.
A total of 653 clients (mean [SD] age = 37.8 [12.9], 26.4% men) with mild to moderate levels of anxiety and depression and a treatment duration of at least 7 weeks were included for analyses. The clients completed questionnaires measuring mixed anxiety-depression (MAD – Patient Health Questionnaire Anxiety and Depression Scale) and insomnia (3 items derived from the Karolinska Sleep Questionnaire representing core DSM-V criteria) on a session-to-session basis. The data were analyzed using latent growth curve models and random intercept cross-lagged panel models.
The results of the latent growth curve models showed that there was a significant decrease in both MAD (cubic slope; B = .002, p < .001, quadratic slope; B = .036, p < .001, linear slope; B = −.205, p < .001) and insomnia (linear slope; B = −.080, p < .001) across treatment. A strong correlation (r = .838, p < .001) between the linear slopes indicated co-occurring change processes. The cross-lagged panel model showed that insomnia significantly predicted MAD at the subsequent measurements (B = .190, p < .001), but not vice versa (B = .252, p = .343).
Changes in MAD and insomnia are co-occurring processes during the course of CBT. Changes in insomnia predicted prospectively changes in MAD, but not vice versa. Targeting insomnia in the context of brief CBT in clients with mild to moderate anxiety and depression may therefore further reduce not only symptoms of insomnia but also symptoms of anxiety and depression.
From the Department of Health Promotion (Thun, Sivertsen, Knapstad, Smith), Norwegian Institute of Public Health, Bergen; Department of Global Public Health and Primary Care (Thun), University of Bergen; Department of Research and Innovation (Sivertsen), Helse-Fonna HF Haugesund Hospital, Haugesund; Department of Mental Health (Sivertsen), Norwegian University of Science and Technology, Trondheim; and Department of Clinical Psychology (Knapstad), University of Bergen, Norway.
Address correspondence to Otto R.F. Smith, PhD, Department of Health Promotion, Norwegian Institute of Public Health, Zander Kaaes Gate 7, 5015 Bergen, Norway. E-mail: email@example.com
The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008.
Received for publication April 16, 2018; revision received November 30, 2018.