Group therapy tackles teen anxiety and insomnia together

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Chinese aged 12-20 years old (an age range that was suggested by scholars to cover a wider developmental span in adolescence); 2. Written informed consent of participation in the study is given by the participant and his/her parent or guardian (for those aged under 18); 3. Willing to comply with the study protocol; 4. Meeting the DSM-5 diagnostic criteria of insomnia disorder and with a score on the Insomnia Severity Index (ISI) \>= 9 (suggested cut-off for adolescents); 5) Presenting with a high level of anxiety symptoms as defined by a total score \>32 and \>37 for males and females, respectively, on Spence Children's Anxiety Scale (SCAS). Exclusion Criteria: 1. A current diagnosis of substance abuse or dependence; a current or past history of manic or hypomanic episode, schizophrenia spectrum disorders, neurodevelopmental disorders, organic mental disorders, or intellectual disabilities; 2. Having a prominent medical condition known to interfere with sleep continuity and quality (e.g. eczema, gastro-oesophageal reflux disease); 3. Having a clinically diagnosed sleep disorder (other than insomnia) that may potentially contribute to a disruption in sleep continuity and quality, such as narcolepsy, sleep-disordered breathing, and restless leg syndrome, as ascertained by the DISP, a validated structured diagnostic interview to assess major sleep disorders according to the ICSD criteria; 4. Concurrent, regular use of medications(s) known to affect sleep continuity and quality, including both western medications (e.g. hypnotics, steroids) and over-the-counter OTC medications (e.g. melatonin, Traditional Chinese Medicine, TCM); 5. Having been enrolled in any other clinical trial investigational products within one month at the entry of the study; 6. Having a clinically significant suicidality (presence of suicidal ideation with a plan or an attempt) as assessed confirmed by research clinician; 7. Currently receiving any structured psychotherapy; 8. With hearing or speech deficit; 9. Night shift worker.