Background: Recent treatment studies with cognitive behavioural therapy for insomnia (CBT-I) have demonstrated effects on both sleep problems and depression. Two previous studies have indicated that the beneficial effect from CBT-I on depression may come through improved sleep, although insomnia severity during treatment had not previously been investigated as a mediator. Aims: Our aim was to investigate if insomnia severity during treatment mediated between CBT-I and depression severity after treatment, in a sample with co-morbid insomnia and depressive symptomology. We also examined whether depressive severity during treatment mediated between CBT-I and insomnia after treatment. Method: The participants were recruited from advertisements and fulfilled criteria for insomnia diagnosis, and had depressive symptomatology (Beck Depression Inventory-second edition: BDI-II > 13). Two-thirds of the participants were diagnosed with major depressive disorder. The participants received four biweekly group sessions of CBT-I or relaxation training (active control). Insomnia severity (Insomnia Severity Index) and depressive severity (BDI-II) were measured at baseline, mid-treatment, post-treatment and 6-month follow-up. The mid-treatment measures were used as mediators. Results: Mediational analyses demonstrated a significant reciprocal relationship between insomnia severity and depressive severity throughout CBT-I, although mid-treatment insomnia had a stronger effect on depression than mid-treatment depression had on insomnia. The results were similar for both post-treatment and follow-up. Discussion: Some improvement in depressive severity after CBT-I is explained by improved sleep. The findings emphasize the importance of making comorbid insomnia a treatment focus in its own right.

Despite efficacy and effectiveness evidence, and recommendations from the National Institute for Health and Care Excellence (NICE), use of CBT self-help materials remains inconsistent in UK mental health services. Since 2006, the Improving Access to Psychological Therapies (IAPT) programme has provided standardized training and mandates routine use of CBT self-help materials by their trainee psychological well-being practitioners (PWPs). This study tested whether the main constructs of the theory of planned behaviour (TPB; attitudes, subjective norms, and perceived behavioural control), past use, prior training and demographic characteristics, would predict PWPs’ intention to use self-help materials routinely in their clinical practice. Stage 1 utilized a standardized procedure to create measures for the constructs of TPB, before the design and testing of a web-based, cross-sectional questionnaire. In stage 2, the questionnaire was administered to a convenience sample of trainee PWPs (n = 94). Data was analysed using multiple linear regression, mediation analyses, and content analysis. TPB constructs predicted intention to use self-help materials, with only direct attitude contributing significantly to 70% of the variance in intention. Past use of materials predicted intention, via direct and indirect mediation. Qualitative data from 43 trainees highlighted clients’ experience of self-help materials as positive, albeit with some practical constraints. The results suggest that the main constructs of TPB have some utility in predicting trainee PWPs’ intention to use self-help materials routinely. Future prospective, longitudinal research could investigate actual use of self-help materials to elucidate cognitive factors involved in trainees’ clinical decision-making post-qualification.

The aim of the current study was to examine how belief in the validity of hallucinations relates to the association between hallucination frequency and associated distress. In a sample of inpatients with psychotic symptoms, results demonstrated that hallucination believability predicted later distress after controlling for symptom frequency. In addition, results were consistent with the hypothesis that hallucination believability mediated the frequency- distress link. Recent randomized controlled trials have supported the efficacy of cognitive behavior therapy for schizophrenia and related psychotic disorders. Further evidence suggests that cognitive behavioral approaches that incorporate mindfulness and acceptance-based strategies may be effective in reducing the believability of positive symptoms. Future trials incorporating longitudinal designs and more detailed assessments of these variables are needed.