BACKGROUND
Despite a growing evidence base that internet-delivered cognitive behavioral therapy for insomnia (iCBT-I) is associated with decreased insomnia severity, its efficacy has been minimally examined in non-veterans.
OBJECTIVE
The objective of our study was to evaluate the efficacy of an unguided iCBT-I (Sleep Healthy Using the Internet [SHUTi]) among veterans.
METHODS
In this single-blind, randomized clinical trial, Operation Enduring Freedom, Operation Iraqi Freedom, and Operation New Dawn veterans eligible for Veterans Health Administration care were randomly assigned (1:1) to receive SHUTi, a self-guided, interactive program, or an Insomnia Education Website (IEW) that provided nontailored and fixed insomnia information. Online assessments were administered at baseline, post-intervention, and 6-months and 1-year post-intervention. The primary outcome was self-reported insomnia severity (Insomnia Severity Index [ISI]). Secondary outcomes were self-reported mental and physical health functioning (Short Form Health Survey for Veterans [VR-36]). Exploratory outcomes comprised sleep diary parameters.
RESULTS
Of the 231 randomized participants (mean [SD] age, 39.3 [7.8] years; 170 male sex [73.5%]); 172 White [74.5%], 26 Black [11.3%], 10 Multiracial [4.3%], 17 Other [7.4%]; 36 Hispanic [15.6%]) randomized between April 2018 and January 2019, 116 (50.2%) were randomly assigned to SHUTi, and 115 (49.8%) to the IEW. In intent-to-treat analyses, SHUTi participants experienced significantly larger ISI decreases compared to IEW participants at all timepoints (n2G = 0.13, 0.12, 0.10, respectively). These corresponded to estimated larger differences in change of -3.47 (95% confidence interval [CI]: -4.78, -2.16), -3.80 (95% CI: -5.34, -2.27), and -3.42 (95% CI: -4.97, 1.88) points on the ISI for the SHUTi group. SHUTi participants experienced significant improvements in physical (6-month η2G = 0.04) and mental health functioning (6-month and 1 year generalized η2Gs = 0.04). Significant sleep parameter improvements were noted for SHUTi, though the pattern and magnitude of these reductions varied by parameter. No adverse events were reported.
CONCLUSIONS
Self-administered iCBT-I was associated with immediate and long-term improvements in insomnia severity. Findings suggest that leveraging technology to meet insomnia treatment demands among veterans may be a promising approach.
CLINICALTRIAL
ClinicalTrials.gov NCT03366870; https://clinicaltrials.gov/ct2/show/NCT03366870