Faulty Alarm PT Cruiser?

I have a 2001 PT Cruiser. I would like to know how to stop my alarm activating in the middle of the night!! I dont know whats causing it and it's driving me nutso. It only goes off every so often and I would like to know if there is any way to disable it PLEASE. I have looked in the fuse box under the hood and cant decide which fuse to pull as the one I was told - for the alarm- apparently (on mine) does the lights.Any help gratefully received. Thanks