Digital cognitive behavioral therapy for insomnia reduces incident depression at one-year follow-up.

Document Type

Conference Proceeding

Publication Date

2018

Publication Title

Sleep.

Abstract

Introduction

Insomnia is a modifiable risk for depression, and a growing body of evidence indicates that targeted insomnia treatment also alleviates concurrent depression. However, few studies have examined if insomnia treatment may be effective in preventing incident depression. This is particularly relevant given the advent of internet delivered insomnia interventions, which has significant scalability given its cost-effectiveness and easy accessibility. As such, this study examined the efficacy of digital cognitive behavioral therapy (dCBT-I) in preventing incident depression. Other functional outcomes were also examined as secondary measures.

Methods

658 individuals with insomnia (DSM-5 diagnostic criteria) were randomized into two conditions: dCBT-I (N=358), or an online sleep education control (N=300). Participants were assessed at three time-points: pre-treatment, post-treatment, and one-year follow-up. Incidence of depression at each time point was operationalized as a score greater than 10 on the Quick Inventory of Depressive Symptomatology (QIDS). Assessments of functional outcomes included cognitive and affective functioning, work productivity, and social functioning.

Results

Among those who did not report significant depression at baseline (N=339), incident depression at post-treatment was lower in the dCBT-I condition (6.5%) than the sleep education condition (11.0%), though this difference was not statistically significant. However, incident depression at one-year follow-up was over four times lower in the dCBT-I condition (5.1%) compared to the sleep education condition (22.0%), χ2(1)=8.7, p=.003. Examination of other functional outcomes also showed greater improvements in the dCBT-I condition relative to the control group.

Conclusion

Findings from this study provide evidence for the potential for dCBT-I to prevent incident depression in those with insomnia.

Support (If Any)

Support for this study was provided from the Robert Wood Johnson Foundation, and from the National Institute of Mental Health R56MH115150 awarded to Dr. Christopher Drake.

Volume

41

Issue

Suppl 1

First Page

A142

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