Not really an AIBU I know, so I guess IABU for posting it here but I know this board is high traffic.
I woke up this morning to my smoke alarm going off. Teenage DC had fallen asleep with candles burning and started a small fire. Fortunately the alarm going off was enough to wake everyone up and get it noticed and put out before any real damage was done. Another couple of minutes and it could have easily been much much worse.
So just sharing a gentle reminder to check your smoke alarms - it's really worth 2 minutes to make sure you're safe.