A 85-year-old woman with a CFS of 6 has been admitted with a fall. She has moderate dementia and takes Donepezil 10 mg, Ramipril 5 mg, and Furosemide 20 mg. The nursing staff report she is intermittently drowsy during the day but becomes agitated and restless at night, attempting to leave the ward. This pattern has been present since admission 48 hours ago. What does this pattern MOST likely represent?