Group-Based Brief Behavioral Therapy for Insomnia for Patients With Chronic Mental Illness

The goal of this clinical trial is to evaluate the effectiveness of a short-term, group-based Brief Behavioral Therapy for Insomnia (BBTI) intervention in chronic psychiatric patients at a hospital day ward.The main questions it aims to answer are:

• Does the BBTI-based group intervention improve subjective sleep quality and reduce the severity of insomnia?
• Does the intervention have a positive effect on psychological well-being and cardiometabolic/physical functions? Researchers will compare an experimental group receiving the immediate 4-week intervention to a waitlist control group, who receive the intervention starting in week five, to see if the intervention improves sleep quality, reduces insomnia-perpetuating behaviors, and enhances overall health status across various timeframes.

Participants will:

1.Attend four weekly 1-hour group intervention sessions that cover sleep structure education, relaxation techniques (including acupressure), sleep-promoting diet principles, and the proper use of sedative-hypnotic medications. 2.Maintain a daily sleep diary to track their subjective sleep quality, daily nutritional intake, and physical activity levels.

3.Complete structured self-report questionnaires assessing insomnia severity (ISI), psychological distress (PHQ-4), and well-being (WHO-5) at baseline (T0), post-program (T1), and during a 9-week follow-up (T2).

4.Undergo physiological and physical function assessments, including measurements for Body Mass Index (BMI), waist circumference, blood pressure, a 10-Meter Walk Test (normal and fast pace), a Timed Up and Go (TUG) test, and a Five-Times Sit-to-Stand Test (FTSST).

Inclusion criteria

• Aged 18 years and older.
• Diagnosed with a psychiatric disorder.
• Experiencing self-reported sleep disturbances, such as difficulty initiating sleep, difficulty maintaining sleep, early morning awakening, prolonged sleep latency, short sleep duration, poor sleep efficiency, or the current use of sedative-hypnotic medications.

Exclusion criteria

• Severe intellectual disability resulting in the inability to complete the assessment questionnaires.
• Severe cognitive impairment (e.g., dementia) that prevents cooperation and participation in the intervention activities.
• Recent clinical instability, high suicide risk, or deemed unsuitable for participation by the primary attending physician.