I don't mind working until midnight or later as often the case is. Someone needs to staff the ER, no matter the hour of the day. I've often been told that I need to find a job with a "normal shift", but don't have any kids or spouse to spend time with. And people in the same situation still frown down on my schedule.
I don't really care when you work, as long as you're comfortable with the time and can tolerate (or even enjoy) your job.