Treatment of disordered sleep and anxiety in school-aged children

INTERVENTION: Participants in each of two treatment conditions will receive therapy based on principles of Cognitive Behaviour Therapy for Insomnia. Treatment will be provided by a Psychologist, Clinical Psychologist, or Provisional Psychologist. 1. Sleep restriction: reducing time‐in‐bed to 30 mins less than the usual average total sleep time. This will be achieved by shifting the child's usual bed time later by 30 minutes. 2. Bedtime restriction: reducing time‐in‐bed to match usual average total sleep time. In both of these interventions, participants will attend two therapy sessions (one week apart, 1 hour on each occasion) and will implement their given schedule for a period of two weeks. Adherence to the intervention will be monitored using a 7‐day sleep diary and wrist actigraphy. CONDITION: Anxiety Insomnia PRIMARY OUTCOME: Sleep Parameters from Sleep Diary: time in bed, sleep onset latency, total sleep time, time awake after sleep onset, and sleep efficiency Spence Children's Anxiety Scale (general anxiety and separation anxiety scales) Worry Scale for Children ‐ total score SECONDARY OUTCOME: Neuropsychological functioning (simple reaction time and digit span) Paediatric Daytime Sleepiness Scale ‐ total score INCLUSION CRITERIA: meet diagnostic criteria for Behavioural Insomnia of Childhood according to the International Classification of Sleep Disorders ‐2 manual