A 57-year-old man presents to the clinic with complaints of excessive daytime sleepiness and chronic fatigue for the past year. His wife reports that he snores loudly and frequently stops breathing during his sleep, which frightens her. He often wakes up with a dry mouth and a morning headache. He admits to dozing off during meetings and while watching television. His past medical history is significant for hypertension, diagnosed three years ago, and type 2 diabetes mellitus, which is well-controlled on metformin. He drinks two beers on weekends and denies smoking or recreational drug use. He works as an accountant and leads a sedentary lifestyle. He is obese with a body mass index of 34 kg/m2. He is afebrile. His blood pressure is 152/94 mmHg with a heart rate of 82 bpm, a respiratory rate of 14 breaths per minute, and an oxygen saturation of 97% on room air.