A 42-year-old man is evaluated for a lifelong history of insomnia. He reports always having had trouble sleeping, but sleep initiation and maintenance have become more difficult over the past few years. He experiences daytime sleepiness but does not have the opportunity to nap. He reports no depressed mood or anhedonia. His wife has not noticed excessive snoring or abnormal or absent breathing during sleep. He drinks one cup of coffee in the morning and drinks one alcoholic beverage 3 to 4 nights per week. Medical history is otherwise unremarkable. He takes no medications.

On physical examination, the patient is afebrile, blood pressure is 142/82 mm Hg, pulse rate is 78/min, and respiration rate is 14/min. BMI is 27. The remainder of the physical examination is normal.

Which of the following is the most appropriate next step in management?