The car is a 1999 Grand Prix Se with a 3.1l engine.
This is getting annoying.
I set the alarm at night and  about five hours later the horn starts
blowing and the lights are flashing.
The first night it went off I thought a cat jumped on it, so I re-set
it and it was fine till morning. The next night it did it again.
So last night, I park in a different spot and set it about two hours
later. Yep, you got it. It sounded off about two hours later!!!!!!!

Is there a relay or timer that is screwed up? Can it possibly be the
battery in the one and only remote transmitter is going bad?

Any ideas???

George