The study type is a prospective observational cohort study of children undergoing adenotonsillectomy (T\&A). The study will recruit the annual caseload of children undergoing T\&A at the Montreal Children's Hospital, QC, Canada; aiming for 200 children. There are no interventions. The purpose of this study is to determine the severity and duration of postoperative pain after T\&A and to link the severity of this pain with the severity of sleep disordered breathing.
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Postoperative Parent Pain Measure (PPPM)
Timeframe: We are asking the parents to record the PPPM twice daily for 14 days.