We really cant help you there. Other than "Disconnect the siren" or other guesses, there is no way to help you other than give you our list of guesses.
And that's what most here do - unless you are willing to do the work yourself, all anyone can do is say "It was this when I went thru it" or "I heard it's caused by that...." Using those techniques, you may fix it fast, or may struggle for months or a year until you stumble on it.

Anyway, here is the list of guesses:
A trunk or dome light not turning off.
An AM/FM head that is dying and not hibernating properly.
A bad alarm siren.
The headlight switch not in the vertical, 12 o'clock position.
A water damaged CLP/SSM due to the car sitting outside and leaking water around the (SRT) WIng, the fuel filler seal, or the trunk lid seal(s).
A bad HVAC "blower motor resistor"
Others will chime in with guesses I am forgetting.

There can be other causes, but those are the big ones. I went to a LOT of trouble to try to help people with this, but most are too lazy to even try, if you are not lazy, click here:
CLICK THIS. If you ARE lazy, you are not a bad person, just average.