A study out of Sydney, Australia compared children who sustained traumatic brain injury to children who sustained orthopedic injuries. Specifically, researchers examined objective sleep outcomes in 23 children ages 5-15 who sustained moderate to severe traumatic brain injury. This group was compared to 13 children who sustained an orthopedic injury. The primary measurements were objective sleep measures using actigraphy watch, and secondarily a subjective sleep measure and fatigue questionnaires. The findings showed “evidence of objective and subjective sleep disturbance in children with moderate to severe TBI, but these two types of sleep measures were not related. It is possible the distinct mechanisms underpin objective and subjective sleep disturbance, which may require different interventions.” 

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https://www.natlawreview.com/article/may-s-international-brain-injury-association-journal-studies