See my previous post for first part of story.
I worked my way along the building, keeping a pillar between me and the car. Finally I was able to see that it was some drunk getting bottled water out of his car and he had tripped the alarm by accident - twice. I couldn't believe my level of control and observation. Afterward, I simply put the gun on safety and went back to bed. Had no trouble getting to sleep. The reason I took the action I did was that I had a vehicle broken into not long before in an nearby motel parking lot.
I have a concealed carry permit and have done a fair amount of reading and training so I felt I was prepared for the incident. My wife sleeps better at night when we travel because there is always a gun with us