Last night, all five of my smoke alarms went off. One at first then the rest. After sounding for a couple of minutes they would reset (I guess) but go off again. This happened around 1:00 AM this morning. I finally shut the ckt breaker off after checking out the entire house for fire/smoke. This morning I have turned the ckt breaker back on and it has been on fo about thirty minutes now without any alarm. What could cause all of them to go off like that? It was scary for my family.