Fear of the police rapping on the window, and waking them up? If keys were in ignition, then DUI due to wine, if not, then no. Only reason I can think of, fear of police and DUI.The question I keep asking myself is why she didn't have the keys in the ignition. If it was so cold outside then how did they sleep in the van without the heat on. I just can't imagine that she would not have the heat on in the car for the entire time (hours) it took the tide to rise enough and to be deep enough to sweep them out into the waters.. . .