Sleep is important in maintaining the physiological function of the human body. Recently several studies have reported that preoperative sleep quality is associated with postoperative emergence delirium (ED) The ED is a common in pediatric patients undergoing general anesthesia with sevoflurane, but studies on the association of sleep quality have been rare. The investigators, therefore, aimed to investigate the relationship between postoperative delirium and pre and postoperative sleep quality in pediatric patients receiving strabismus surgery through this study
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Preoperative Pittsburgh Sleep Quality Index(PSQI)
Timeframe: 1. Before the surgery ( Within a week before the surgery)
Watcha scale (For emergence delirium)
Timeframe: 20 min after awakening ( In the post anesthesia recovery room)
Pediatric anesthesia emergence delirium scale (PAED) scale
Timeframe: 20 min after awakening ( In the post anesthesia recovery room)
Postoperative Pittsburgh Sleep Quality Index(PSQI)
Timeframe: 1 day after the surgery ( < 24 hours )