2000 Cadillac Deville Dome Lights stopped working

Dome lights stopped working about 3-4 months ago. Yesterday I was going to go somewhere and the battery was dead. When I put the charger on--the dome lights were on. I figured that's what drained the battery. Now after I charged the battery and drove the car a distance, everything seems to be working correctly. Is there a module or something like that, that controls the dome light function? I'm concerned if it's intermittant it may allow the dome lights to stay on again and drain the battery and I might get stranded somewhere. Thanks, waiting for your reply, Terry