This project is conducted by the University of Reading and the Dingley Child Development Centre. Through this mixed-methods study, we are exploring how different sleep interventions – behavioural (sleep hygiene) and pharmacological (melatonin) – affect sleep quality, sensory processing, and emotional regulation in autistic children and children with other neurodevelopmental conditions, as well as parental mental health. We combine actigraphy, quantitative questionnaires, and qualitative parent interviews to understand not only whether these interventions work, but also why and for whom.