Participants in the intervention group will receive behavioural training by psychologists in three sessions over three weeks

Participants in the control group will receive usual care. They will also attend their usual appointments with the psychiatrists. They will not receive any intervention.

The behavioural interventions have been designed on the basis of three sources. Firstly, a systematic review conducted by the research team that examined the best evidence in the field in different countries. Secondly, a Delphi study, which aimed to identify behavioural interventions that can be used to manage sleep difficulties in Saudi Arabia in accordance with professionals' views and primary caregivers' needs, and which was also conducted by the research team. Thirdly, evidence-based practice resources that help in understanding and managing sleep difficulties will be translated into Arabic.

This is used widely to assess sleep, pre and post intervention, and focuses on measurement of the following subscales: Bedtime resistance, sleep onset delay, sleep duration, sleep anxiety, night waking, parasomnias, sleep-disordered breathing and daytime sleepiness. Higher scores indicate significant sleep difficulties.

This scale consists of 48 items that focus on five subscales: conduct problems, learning disabilities, psychosomatic disorders, impulsivity and hyperactivity and anxiety. It focuses on children aged 3-17 years.

This scale consists of 36 items that focus on sleep difficulties in adults, and is divided according to the following subscales: insomnia, hypersomnia, circadian rhythm sleep disorders, sleep terrors and sleepwalking.

This outcome records the physical activity in order to provide sleep duration in seven days at baseline and seven days after a month of randomization to measure change. It will be used as an objective measure with some participants.