单选题 Doctor: Morning, Mr. White. Come in. And what can I do for you today?
Patient: Well, doctor, ______ I often wake up at 3: 00 in the moming and I just can't get back to sleep.
Doctor: I see and how long has this been going on?
Patient: Oh, about a month now. I wonder if you could prescribe something.
A. I'm having difficulty sleeping. B. I'm watching TV every night.
C. I'm getting too much sleep. D. I'm eating too much.