An interventional study of Acceptance and Commitment Therapy for Insomnia and Attentional Control Group in Chronic Insomnia, sponsored by Babes-Bolyai University. Recruiting at 1 site in Romania. Open to participants aged 18 Years to 59 Years. Per ClinicalTrials.gov, last updated 2026-09-25.
Sponsored by Babes-Bolyai University · Not applicable, Interventional, and Treatment
This is a prospective, randomized-controlled trial that assesses the efficacy of a brief Acceptance and Commitment Therapy (ACT-i), compared to an attentional control group, in adults with chronic insomnia. The interventions will be evaluated for their impact on insomnia severity, cognitive function, depression, anxiety, psychological flexibility, and sleep beliefs - measured before treatment, two weeks after and at a three-month follow-up.
Insomnia is the most prevalent sleep disorder. It is associated with impairments both physically and psychologically. Therefore, it usually causes a suite of durable stressors in numerous aspects of life, such as academically, professionally, socially, and financially. Given its widespread impact, early effective treatments are crucial to prevent long-term consequences.
The first line of treatment is Cognitive-Behavioral Therapy for Insomnia (CBT-i). Despite its effectiveness, approximately 60% of individuals with chronic insomnia and comorbidities do not go into remission after treatment or simply do not adhere to it. Acceptance and Commitment Therapy for Insomnia (ACT-i) has great potential for overcoming this limitation, as it focuses on accepting the feelings and thoughts associated with insomnia, through value-based actions. However, more studies on ACT-i as a monotherapy are needed.
This study aims to evaluate the efficacy of brief, group ACT-i for chronic insomnia in adults, versus an attentional control group. Participants will be aged between 18 and 59 years, diagnosed with chronic insomnia who will be randomly assigned to either ACT-i, or the control group. To limit age-related sleep changes, only participants aged up to 59 will be included, as sleep difficulties tend to increase after the age of 60. The interventions will be performed in groups, in 2 weekly sessions. Their effects will be investigated for the primary outcome related to the severity of insomnia, and secondary outcomes related to depression, anxiety, cognitive functioning, psychological flexibility, and beliefs about sleep at pre-test, post-test at two weeks and three-month follow-up. After the interventions, participants will complete an inventory regarding the adherence and satisfaction to both interventions. This is the first attempt to investigate a group-based ACT-i as monotherapy with an attentional control group delivered in an accessible, brief-group format. Specifically, the sessions are implemented briefly in 2 group sessions, unlike other studies that have (at least) 4 group sessions. Furthermore, the investigators will also compare their adherence rates and patients' satisfaction.
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This study's planned enrollment of 76 is above the median of 68 across 2,350 interventional studies indexed under Sleep Initiation and Maintenance Disorders.
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Exclusion Criteria:
The intervention is available in its individual and group format, which can be adapted to an online context in "Acceptance and Commitment Therapy for Insomnia: A Session-By-Session Guide", by Renatha El Rafihi-Ferreira (Rafihi-Ferreira, 2024). It comprises the details of each ACT-i group session with illustrations and examples for the trained therapists. Participants will be requested to register to an Online Platform, such as Google Meet, to attend the two sessions which will be guided by a trained therapists. Each session will have approximately 120 minutes. They will receive instructions from the therapists and handouts at the end of each session. Facilitators will receive training from a specialized mental health professional.
Behavioral: Acceptance and Commitment Therapy for Insomnia
Participants will receive this intervention in an online platform by a trained professional. His training will be provided by a mental health expert with experience in carrying out psychoeducational and non-directive group sessions. This group will match the ACT-i intervention in terms of session duration, delivery format, group interaction, facilitator contact, time and handouts/ homework.
Behavioral: Attentional Control Group
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.
Change in the score of Insomnia Severity Index (ISI);
The Insomnia Severity Index (ISI) is a brief tool of chronic insomnia. It consists of 7 items about the severity of insomnia, its noticeability, and daytime functioning. Total scores range from 0 to 28, with higher scores reflecting more severe clinical insomnia.
Time frame: baseline, 2 weeks after the intervention
Change in the score of Insomnia Severity Index (ISI)
Follow-up evaluation of the severity of insomnia using ISI
Time frame: 3 months after the intervention
Change in the score of Patient Health Questionnaire-9
The Patient Health Questionnaire-9 (PHQ-9) is a brief tool of depression. It consists of 9 items about depressive symptomatology, such as anhedonia, sadness and fatigue. Total scores range from 0 to 27.
Time frame: two weeks after the intervention and 3 months after the intervention
Change in the score of Multidimensional psychological flexibility inventory (MPFI-24; Gregoire et al., 2020)
The Multidimensional psychological flexibility inventory (MPFI-24) is a 24-item measure of psychological flexibility, including acceptance, mindfulness, and values-based actions. Total scores range from 24 to 144.
Time frame: two weeks after the intervention and 3 months after the intervention
Change in the score of the Dysfunctional Beliefs and Attitudes about Sleep (DBAS-16)
The Dysfunctional Beliefs and Attitudes about Sleep (DBAS-16) is a 16-item scale measuring dysfunctional sleep-related cognitions. Total score is added up and divided by 16, and a higher score represents higher unrealistic expectations regarding sleep.
Time frame: two weeks after the intervention and 3 months after the intervention
Change in the score of The Cognitive Failures Questionnaire (CFQ)
The Cognitive Failures Questionnaire (CFQ) is a self-report tool of the frequency of daily cognitive failures, such as forgetfulness or lapses in attention. It has 25 items and total scores range from 0 to 100, with higher scores indicating more subjective cognitive failure.
Time frame: two weeks after the intervention and 3 months after the intervention
Change in the score of Barkley Deficits in Executive Functioning Scale (BDEFS-SF)
The Barkley Deficits in Executive Functioning Scale (BDEFS-SF) is a 20-item self-report measure of executive functioning deficits. Each item is rated on a 4-point Likert scale, ranging from 1 ("never or rarely") to 4 ("very often"). Total scores range from 20 to 80.
Time frame: two weeks after the intervention and 3 months after the intervention
Change in the score of The Generalised Anxiety Disorder 7 (GAD-7)
The Generalised Anxiety Disorder 7 (GAD-7) is a 7-item self-report measure of the severity of anxiety. Each item is rated on a 4-point Likert scale, ranging from 0 ("not at all") to 4 ("nearly every day"). Total scores range from 20 to 80.
Time frame: two weeks after the intervention and 3 months after the intervention
Satisfaction: Client Satisfaction Questionnaire (CSQ-8)
The Client Satisfaction Questionnaire (CSQ-8) is a brief tool of general satisfaction with the treatment being given. Each item is rated on a 4-point scale, ranging from 1 ("weak") to 4 ("excellent"). Total scores range from 8 to 32, with higher scores reflecting greater satisfaction.
Time frame: one day after the intervention, 3 months after the intervention
Adherence: Adherence and satisfaction questionnaire (Ferreira et al., 2024)
Adherence and satisfaction questionnaire is a brief self-report tool of adherence and satisfaction with the provided treatment. It has 8 items, with yes and no answers.
Time frame: one day after the intervention, 3 months after the intervention
Plan to share: Yes — Will share IPD used in the results of the publication, upon request.
Supporting information: Study protocol, Statistical analysis plan, Informed consent form
Time frame: The IPD may be shared after publication upon request, with no end date.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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