A 72-year-old woman with a 5-year history of Alzheimer's disease (MMSE 12/30) is admitted to the hospital for hip fracture repair. On postoperative day 2, nursing staff report that she is not recognizing them, is calling out repeatedly, and is trying to climb out of bed. She was alert and oriented to person (though not to time and place) before surgery. Her current medications include morphine, diphenhydramine, and haloperidol (started yesterday for agitation). Vital signs: BP 140/90, HR 98, RR 20, Temp 37.2°C. What is the most appropriate immediate next step?