What a stupid I am...

When we got home from the movies this afternoon, I thought that I would start my van and let it run for a little while to check out if the overheat / no-heat problem is any better since I took the thermostat out. Well...when we went outside to leave for dinner (2+hours later) the car wasn't running any more!  I completely forgot that I left it running in the driveway and laid down on the couch for some napping.  D'OH!