You are answering a USMLE-style medical question. Question: A 21-year-old college student comes to the physician because of daytime fatigue for 2 months. He has problems getting to sleep at night and frequently falls asleep during class. Recently he has started skipping classes altogether. He goes to bed between 11 p.m. and 1 a.m. but cannot fall asleep for 2–3 hours. When he wakes up at 8:30 a.m., he feels extremely drowsy, and he tries to overcome his fatigue by drinking 2–3 cups of coffee a day. He naps at various times during the afternoon, often for more than an hour. He stopped watching videos on his smartphone at night because of suggestions from his peers. He states that he has tried over-the-counter melatonin pills and exercising at 8 p.m. without success. He has no history of serious illness. He does not smoke. He drinks three to five beers on weekends. Physical examination shows no abnormalities. Which of the following is the most appropriate recommendation for this patient? Options: A) Trial of diphenhydramine B) Stop evening exercise C) Alcoholic beverage prior to bedtime D) Scheduled afternoon naps Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.