When I get the call, I just know. Can I just answer barely awake and go back to sleep or do I need to be up in a flash? Some of it is the intuition that comes with getting calls in the dead of the night over many years. It's the languid pace of a person's voice with a bothersome question, the timid entry phrase, "I'm sorry to bother you with this..." Or it's the fear and panic in the voice of the person on the other end of the line, the short demands with panting in between. The phone rings at three a.m. The caller says, "We need you in OR four, NOW " I don't bother to ask. I just slam down...