A 42-year-old man comes to his primary care physician due to daytime sleepiness. He often falls asleep during meetings and while watching television and has even fallen asleep while driving. He does not feel refreshed when waking and has occasional morning headaches. He has not had abnormal dreams or visual hallucinations when falling asleep or on waking. He has no significant past medical history and is a lifetime nonsmoker. He drinks 2 or 3 beers on Friday nights. Blood pressure is 148/100 mm Hg, pulse is 78/min and regular, and BMI is 32 kg/m2. Cardiopulmonary examination shows no abnormalities. Arterial blood gas analysis is normal. What is this patient's most likely diagnosis?
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