A divorced 78-year-old man comes to your office for an evalu…

A divorced 78-year-old man comes to your office for an evaluation. He has a medical history significant for obesity, hypertension, coronary artery disease, and diabetes mellitus. The patient complains of excessive daytime sleepiness and foggy thinking. He falls asleep between 10 and 11 P.M. and wakes up between 6 and 7 A.M. What is the most appropriate next step?