A 38-year-old woman is undergoing elective abdominal hysterectomy under general anesthesia. After induction with propofol and intubation, the anesthesiologist notes that the patient exhibits conjugate deviation of eyes upward and medially, with a blink reflex still present. The pupils are moderately dilated and react sluggishly to light. Spontaneous respiration is present but irregular. What stage of anesthesia as per Guedel's classification is the patient currently in?