My alarm is the same as the one in my pizza shop so when it goes off I can not know where the disturbance originates. Our bedrooms are all located together in a section of the house that is, for practical purposes, inaccessible from all but one direction. My kids are 5 and 3.
I have experienced several false alarms and zero real ones.
My response has and will always be the same. My Glock is in the gunvault next to my bed, my phone is next to it. I grab them both, check the hallway/kids rooms and wait there in safety for the alarm company to call. Once they tell me which zone is the problem, I can decide how to proceed, which so far has been a single, nonrecurring front motion, which means a spider, so I go kill the spider.