A patient with type 1 Diabetes Mellitus is admitted to the medical unit with an acute exacerbation of chronic obstructive pulmonary disease. He is placed on IV piggyback antibiotics, nebulizer treatments with albuterol, and an IV corticosteroid, and he is also taking a proton pump inhibitor for gastroesophageal reflux disease. He takes a dose of glargine insulin every evening. This evening the nurse notes that his blood glucose level is 170 mg/dL. The next morning, his fasting glucose level is 202 mg/dL. What is the most likely cause of his elevated glucose levels?