2007 Saturn Vue interior lights and alarm

This just recently began.
I park and lock the car. Alarm goes of at some time.
I can stop the alarm with unlock from remote. However, interior lights remain on. If I lock the car, at some point the alarm sounds.
Leaving the car unlocked, alarm never sounds.
For tonight, I have disconnected battery.
Need to figure it out in the morning. Any suggestions would be welcome.