An Observational Prospective Study of Anesthetic Sensitivity Assessed by Alpha Band Power and Its Association With Emergence Time From Sevoflurane General Anesthesia in Young Adults.

The goal of this observational study is to determine the relationship between brain activity patterns and recovery time in adult patients (ages 35-50, ASA I-II) undergoing elective general anesthesia. The main question it aims to answer is: \- Does a lower magnitude of intraoperative alpha wave power correlate with a longer time for patients to emerge from general anesthesia? Participants will: * Undergo a standardized general anesthesia (GA) protocol for elective surgery. * Have their EEG activity recorded using a standard clinical BIS™ anesthetic depth monitor during the procedure. * Have their time to awakening precisely measured after the cessation of anesthetic gases.