Sleep restriction (SRT) and stimulus control (SC) have been found to be effective interventions for chronic insomnia (Morgenthaler et al., 2006), and yet adherence to SRT and SC varies widely. The objective of this study was to investigate correlates to adherence to SC/SRT among 40 outpatients with primary or comorbid insomnia using a correlational design. Participants completed a self-report measure of sleepiness prior to completion of a 6-week cognitive behavioral treatment group for insomnia. At the posttreatment period, they rated their ability to engage in SC/SRT using a survey. Results from standard multiple regression analyses showed that perceiving fewer barriers (i.e., less boredom, annoyance) to engaging in SC/SRT and experiencing less pretreatment sleepiness were each associated with better adherence to SC/SRT. Adherence to SC/SRT was associated with outcome. Implications of these findings are that more work is needed to make SC/SRT less uncomfortable, possibly by augmenting energy levels prior to introducing these approaches.
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