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A 40 year old man presents with complaints of “low energy” and daily headache. He says most days, he feels pretty “tired” and frequently gets bilateral, dull frontal headaches in the morning that are improved when he takes ibuprofen. He feels sleepy when he wakes up in the morning and that feeling continues throughout the day. He admits to falling asleep during the day, even a few times during meetings at work. He reports getting 8 hours of sleep “as far as I know” and having a healthy appetite. He says he sometimes feels down, especially when he is tired. He denies chest pain, shortness of breath (unless he is heavily exerting himself), and history of migraines. He enjoys hunting on his friend’s ranch every weekend and works as an engineer on oil rigs. He does not know if he snores, but says his ex-wife told him that he snored sometimes-- however, that was over 5 years ago. Vitals are temperature of 98.4, heart rate of 83, respiratory rate of 13, and blood pressure of 144/92. His BMI is 44. Physical exam is significant for obesity, neck diameter of 17.5 inches, and slightly distant normal heart sounds. Which of the following is most likely to reveal the cause of his symptoms?