The goal of this clinical trial is to learn if melatonin can decrease emergence agitation in pediatric post tonsillectomy. The main questions it aims to answer are: Does melatonin decrease emergence agitation in pediatric post tonsillectomy? What medical problems do participants have when taking melatonin? Researchers will compare melatonin to a placebo (a look-alike substance that contains no drug) to see if melatonin works todecrease emergence agitation in pediatric post tonsillectomy Participants will receive Oral melatonin at a dose of 0.5 mg/kg (maximum 20 mg) administered 30 minutes before induction of anesthesia. Dose chosen based on prior pediatric studies and safety data.
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Incidence and Severity of Emergence Agitation (EA): EA will be assessed using the Pediatric Anesthesia Emergence Delirium (PAED) scale
Timeframe: 5, 10, 15, and 30 minutes after arrival in the PACU.