In a randomize, prospective, double-blind study, the subjects are 100 premedicated children, aged 3 to 6 years, who undergo one type of surgical procedure, hernia repair surgery. Anesthesia is maintains with propofol anesthesia (group P, n=50) or with sevoflurane anesthesia (group S, n=50). and fentanyl administered during surgery. Faces Pain Scale (FPS) is use to assess pain severity.