A 52-year-old obese man complains of loud snoring, witnessed apnoeas and daytime somnolence. His Epworth Sleepiness Scale is 15. He has hypertension and a neck circumference of 45 cm. What is the most appropriate next step in his assessment?AOvernight oximetry alone and treat if intermittent desaturations are seenBImmediate initiation of continuous positive airway pressure (CPAP) without further assessmentCFormal polysomnography to confirm obstructive sleep apnoeaDOrder brain MRI to exclude intracranial pathologyEStart modafinil for daytime sleepiness without further investigationCheck my answer