Bright Light Therapy for Adolescent Depression

INTERVENTION: Bright Light Therapy Participants allocated to receive Bright Light Therapy will be given basic (age appropriate) information (designed for this study) regarding sleep and the circadian rhythm. Treatment will involve individualised behavioural instructions, including how and when to use the Re‐timer glasses and when to avoid bright light in the evening. The participants will be instructed to wear Re‐Timer bright light glasses for between 30‐60 minutes daily, for three weeks total. Behavioural instructions will differ for each participant, depending on the severity of sleep timing delay and desired bed and wake up times. Wake up times will be advanced by half an hour each morning until a wake up time of 6am is achieved (bright light therapy treatment sessions 1 and 2). Any issues that arise, regarding treatment implementation (e.g., social obligations conflicting with treatment etc.), can be discussed with the psychologist in bright light therapy treatment sessions 2 and 3. Once this desired wake up time is achieved, a period of consolidation will occur, where the participant maintains a consistent sleep schedule (e.g., set bed times and wake up times), whilst still using the bright light glasses (bright light therapy treatment session 2 and 3), and relapse prevention instructions will be provided (bright light therapy treatment session 3). Brief Behavioural Activation for Adolescent Depression Brief behavioural activation (Brief BA) for adolescent depression is a low‐intensity, brief, structured behavioural intervention that can be delivered by a range of healthcare professionals (Pass, Lejuez & Reynolds, 2017). Brief BA is delivered over 8 1‐hour sessions across 6 weeks (separate from bright light therapy sessions, yet commencing immediately after completion o CONDITION: Depression; ; Depression Mental Health ‐ Depression PRIMARY OUTCOME: Depression: ; ; Change in Revised Child Anxiety and Depression Scale scores. [RCADS: Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation (primary endpoint), 1 month follow‐up, 6 month follow‐up.; ; ] Depression:; ; Percentage with Schedule for Affective Disorders and Schizophrenia or School aged Children (K‐SADS) diagnosed depression [K‐SADS: Pre‐treatment, Post‐treatment (primary endpoint), 1 month follow‐up and 6 month follow‐up.] SECONDARY OUTCOME: Anxiety: ; ; Change in Revised Child Anxiety and Depression Scale scores. ; ; [RCADS: Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.] Daytime Functioning: ; ; Change in Flinders Fatigue Scale scores. [Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.] Daytime Functioning: ; ; Change in Pediatric Daytime Sleepiness Scale scores. [Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.] Sleep: ; ; Change in Insomnia Severity Index scores.[Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.] Sleep: ; ; Change in objective (Dreem) sleep parameters (e.g., sleep onset latency, total sleep time, sleep efficiency, percentage/time spent in REM, N3 etc.). ; [Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.] Sleep: ; INCLUSION CRITERIA: Meet diagnostic criteria for Major or Persistent Depressive Disorder. ; Change in sleep diary sleep parameters (e.g., bed time, rise time, sleep onset latency, total sleep time, sleep efficiency).[Pre‐treatment, post‐bright light therapy/ control, post‐brief behavioural activation, 1 month follow‐up, 6 month follow‐up.]