Sleep and language are intimately linked over childhood, yet objective measurements of sleep behaviour have never been compared between children with developmental disorders of language and their language-typical peers. The aim of this two-study series was to assess an emergent hypothesis that children with poor structural language development may also exhibit poor sleep. In Study 1, 196 parents of 4-10 year-old children completed the Children’s Sleep Habits Questionnaire and the Children’s Communication Checklist-2, including the...