A Rude Awakening

This morning, at 5:45am, we were jarred awake by the sound of our fire alarms throughout the house blaring their repetitive "BEEP, beep, BEEP, beep, BEEP, beep..." Ryan bolted out of bed and ran to check on the boys, I on the other hand took a minute to figure out what was happening and then helped Ryan investigate.
We didn't find any fire and didn't smell anything burning. Ryan went down and flipped the breaker switch in the basement (to make the beeping stop) but we never figure out what caused the alarms to go off.
I decided that it is nice to have the alarms hard wired throughout the house so if one goes off they all go off, but it also means you can't tell which alarm triggered the reaction. However, I vaguely remember hearing it somewhere in the rear of the house before the one in our bedroom went off.
Tate, for some reason, was asleep on the couch and didn't wake up. I was standing in the kitchen when I heard Canton in a hesitant voice say, "Oran, go get Mom." Oran came out and said, "Mom, I heard a loud noise!" I scooped him up, assured him everything was alright and put him back to bed. Before I left the room Canton whispered, "Was there a fire Mommy?"
We never found anything, but it was pretty weird.
I decided that it was not my favorite way to wake up - once the excitement was over we all went back to sleep for a couple of hours.