A 55-year-old man presents with 1 year of restless, non-restorative sleep and daytime fatigue. He falls asleep within minutes of lying down and has dozed off while watching television. He lives alone and lost his job 6 months ago; he feels stressed but denies low mood or loss of interest. He takes no medications, has no known allergies, and drinks 2 beers most evenings. BMI is 36 kg/m2, neck circumference is 43 cm (17 in), and Mallampati class is III; the remainder of the examination is normal. His STOP-Bang score is 6.
| Heart rate | 78/min |
| Respiratory rate | 16/min |
| Temperature | 36.8 °C |
| O2 saturation | 98%, room air |
| Blood pressure | 140/90 mm Hg |
Question 1 of 15
Which one of the following investigations is the most appropriate to confirm the diagnosis and guide treatment?
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