Brief Trial of ACT-i for Adults With Chronic Insomnia

Monotherapy ACT-i, with no behavioral components, is a brief and low-intensity treatment that has recently been detailed by experts in the field in a session-by-session guideline, intending to help people affected by chronic insomnia. The key components of the sessions are psychoeducation, mindfulness, values and actions derived from chosen values, and defusion. An adapted, brief and online version of the intervention was developed by the authors of this study. Both interventions were matched in terms of overall duration and delivery format. Each session was tailored to follow a comparable format. Therapeutic alliance, psychoeducation, sleep hygiene, relaxation training and homework was targeted in the first session. In the second session, ACT-i focused on values, acceptance strategies and psychological flexibility. This version will be published online upon request. Each session will last 120 min. They will be delivered once per week, for two consecutive weeks.

The focus of the sessions will be on participants, on general topics. It will not include any active, psychological intervention components, such as cognitive restructuring or ACT processes. No recommendations or psychological guidance will be given. Each session will last 120 minutes. It will be held once per week, for two weeks.