Overview

This mixed-methods randomized controlled trial investigates whether a nurse-supported mobile app for self-help cognitive behavioral therapy for insomnia (CBT-I) effectively reduces insomnia severity among informal cancer caregivers, compared to sleep hygiene education.\\ The primary research question is:\ Does nurse-supported mobile app for self-help CBT-I lower insomnia severity among cancer caregivers compared to sleep hygiene education at post-intervention and 3-month follow-up?\\ A total of 208 participants will:\ 1. Be randomly assigned to one of two groups:\ (i) the nurse-supported mobile app-based self-help CBT-I group, which involves a 6-week CBT-I program delivered via a WeChat mini program along with weekly nurse support sessions (up to 20 minutes each); or\ (ii) the sleep hygiene education group.\ 2. Complete assessments at baseline, post-intervention, and 3-month follow-up to measure changes in insomnia severity (primary outcome). Secondary outcomes include subjective sleep outcomes, psychological well-being, caregiver burden, fatigue, health-related quality of life, and participants' acceptability and satisfaction.\\ As recommended for trials of complex interventions, investigators will conduct a process evaluation in alignment with the Medical Research Council (MRC) guidance. The key functions of the process evaluation include: \*(1) implementation, (2) mechanisms of impact, and (3) context.\*

Eligibility

Inclusion Criteria:

• Age ≥18 years
• Informal caregiver (e.g., family member or a friend) who co-resides with a cancer survivor of any site or stage and provides at least 4 hours of unpaid daily care. If two or more caregivers are available for a cancer survivor, the one providing most of the daily care will be included.
• Able to understand the research procedures, and read and communicate in Chinese
• Able to use WeChat
• Insomnia severity index scores \> 7

Exclusion Criteria:

• Another sleep disorder (e.g., obstructive sleep apnea, restless leg syndrome, rapid eye movement behavior disorder), besides insomnia, that is not adequately treated
• Psychotic disorders (e.g., bipolar disorder, schizophrenia); Suicidal ideation with intent and plan OR attempted suicide within the past 2 months
• Currently taking any psychotropic drugs (e.g., antidepressants, anxiolytics, sleep medications)
• Unstable or acute medical condition or condition requiring surgery in the next 6 months; Pregnancy; or Epilepsy
• Currently participating in any other interventional program
• Prior experience with CBT-I
• Night, evening, early morning or rotating shift work
• Currently caring for a cancer patient receiving hospice care