rear dome light and door lights stay on

1986 Mercedes 560SEL:  This question was edited.  Not only was the rear dome light on, but the rear door lights were also on. When I was driving I noticed that the rear dome light was on. After parking, I noticed the door rear door lights were also on.  I opened all doors and shut them to make sure a door was not open. After doing this the light went out.  The next time I was drivng i noticed the lights were on again.  I opened/shut all doors again but the lights remained on.  They intermitantly go off and on.  They are are now and my car is setting in the garage with all the doors shut.