Battery dead in 2000 BMW 740IL control panel didn't turn off

Last night I could not get the control panel light to go off or the light on the gear shift to go off. Now this morning the battery is dead. Yesterday I drove approx 200 miles ran some errands and left my dog in the car while I was inside the store.  I thought I disabled the alarm system since it didn't go off while she was in there.  After the second stop, my remote key quit working, I couldn't lock or unlock the doors with the remote key. When I got home, and tried to lock the door with the key it still didn't work. The key led flashed once or twice slowly, then more rapidly when I tried to lock the car. In addition the control panel light would not go off, or the light on the gear shift.  I turned the key off and on the air bag warning light came on, then went off.  Lights still wouldn't go off.  After reading the manual thinking it might be something with the internal motion sensor, being triggered because of the dog inside the car. I tried everything I could think of but the control panel light never went off, or the light on the gear shifter.  Now the battery is dead and I am totally stumped and frustrated. HELP!!!