Preoperative Sleep Disorders and Postoperative Delirium in Children Undergoing Congenital Heart Surgery

The investigators are going to conduct a prospective observational cohort study in pediatric patients aged 28 days to 14 years old scheduled for elective cardiac surgery with cardiopulmonary bypass. The primary purpose of this study is to explore the effect of preoperative sleep disturbance on the incidence of postoperative delirium. Sleep status will be assessed using the Brief Infant Sleep Questionnaire(BISQ) and Children's Sleep Habits Questionnaire (CSHQ), and postoperative delirium status will be evaluated by Cornell assessment of pediatric delirium(CAPD). During the peri-operative period, children will wear actigraphs to record their sleep parameters.