单项选择题

W: Now then, Mr. James, what seems to be the matter
M: I just can’t sleep, doctor.
W: I see. And how long have you had this problem
M: Oh, for about two months now.
W: And how about your work
M: Well, I have been working a lot lately-10 to 11 hours a day.
W: Maybe you should take a holiday and just relax for a while.
M: Well, I can’t right now. We’re in middle of some important business.
W: So,you’re worried about it
M: Yeah, I guess so.
W: Well, maybe you should consider a job change.
M: Yeah, well, it’s pretty hard to find a new job at my age, you know.

From what time could the man not fall sleep at night（）

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