SleepFix for Youth: Digital Behavioural Therapy for Insomnia With E-Psychologist Support

This pilot randomised, open-label, parallel-group controlled trial will evaluate the feasibility, acceptability and effects of a psychologist-supported digital behavioural therapy for insomnia (dBTi) compared to a wait-listed active control (digital sleep health education) in young people aged 16-24 years with insomnia symptoms. The primary objectives are to evaluate the feasibility of conducting a full-scale trial by assessing recruitment, consent and randomisation rates, intervention uptake, and data completeness. Secondary objectives include exploring treatment effects on insomnia severity (Insomnia Severity Index), sleep diary metrics, sleep quality, fatigue, and mood (depression and anxiety symptoms). Post-intervention interviews will assess participant experience and acceptability. Results will inform the design of a larger randomised controlled trial.

Insomnia is a common sleep disorder among young people, with significant impacts on mental health, daily functioning, and wellbeing. Cognitive Behavioural Therapy for Insomnia (CBTi) is the recommended first-line treatment, and digital delivery offers a scalable way to improve access. Despite strong evidence in the adult literature supporting digital CBTi and standalone individual treatment components of CBTi (e.g., sleep restriction), there is limited research examining their effectiveness and feasibility in young populations. This pilot, open-label, parallel-group randomised controlled trial will evaluate the feasibility, acceptability, and effects of SleepFix, a smartphone application delivering digital Brief Behavioural Therapy for Insomnia (dBBTi), supported by weekly contact with an e-psychologist, compared to an active control consisting of online Sleep Health Education modules. Participants (n = 40) aged 16-24 years with insomnia symptoms will be recruited nationally via online advertisements and community networks. Following online pre-screening and a telephone eligibility interview, eligible participants will provide electronic consent and complete baseline questionnaires and a 7-day sleep diary before randomisation (1:1) to one of two groups: 1. Intervention group: Participants will use the SleepFix mobile app, which delivers digital Brief Behavioural Therapy for Insomnia (based primarily on sleep restriction therapy), alongside weekly 15-20minute calls from an e-psychologist for 3 weeks, with an optional additional 3 weeks of therapy. 2. Control group: Participants will receive three online Sleep Health Education modules delivered bi-weekly across a 6-week period. After completing the final follow-up, participants in the control group will be offered access to the SleepFix app and e-psychologist support. Assessments will occur at baseline, 6 weeks (post-treatment), and 14 weeks (follow-up). The primary outcomes are feasibility measures, including recruitment, consent and randomisation rates, intervention uptake, and data completion. Secondary outcomes include exploring treatment effects on insomnia symptoms (Insomnia Severity Index), sleep-wake metrics from daily sleep diaries, sleep quality, fatigue, mood (depression and anxiety symptoms), and overall acceptability of the intervention. Participants in the SleepFix intervention group will be invited to take part in a brief post-study interview exploring their experiences and acceptability with the SleepFix app and e-psychologist support. The study will be conducted entirely online and coordinated from the Woolcock Institute of Medical Research, Sydney, Australia.