Clinical Research Directory

Inclusion Criteria: 1. Chinese adolescent aged 12-18 years old 2. presence of insomnia problems as defined by insomnia severity index ≥ 9 (locally validated cut off for detecting clinical insomnia in adolescents) 3. presence of depressive problems as defined by Patient Health Questionnaire-9 (PHQ-9) using cut off of 10 for detecting clinical depression 4. ability to read and understand Chinese 5. possession of smartphone Exclusion Criteria: 1. presence of prominent suicidality (suicide plans and suicide attempts) as determined by the Mini-International Neuropsychiatric Interview (MINI) 2. a clinical diagnosis of psychosis, schizophrenia, bipolar disorders, or intellectual disability 3. presence of other sleep disorders that significantly affect sleep continuity or sleep quality (e.g. restless leg symptoms or obstructive sleep apnea syndrome) as determined by validated Diagnostic Interview for Sleep Patterns and Disorders 4. currently receiving psychological treatment for insomnia and/or pharmacological treatment for depression