I was disoriented at first, and thought it might be my phone alarm (which was set to a furiously urgent nuclear power station alarm so I would wake up and not miss my plane) but it seemed to early, and too dark. At the same time, I WANTED it to be the phone alarm not the smoke detector, but pretty soon had to admit it really was the smoke alarm. I realized it was the upstairs smoke detector going off, so I had to go check. I opened the bedroom door, could see smoke but it wasn't very thick, and no heat. I first quickly opened the balcony door, as that is our designated, and practiced escape route. I had a split second to decide if I should get the kids out now, or check downstairs, but I saw that the smoke wasn't really thick at all, so I went down; half way down, I could still see only light smoke, and by the time I got to the bottom, eyes on the kitchen (I knew it would be there) I saw the pot on the stove, smoking furiously but not yet burning -- and Kanji on the sofa completely out to it, not from smoke inhalation, but from drunkenness.
I found the living room detector had no battery. I'd have know about the pot that much sooner if it was functional, so I quickly remedied that with a new battery. It was the upstairs one that had gone off. We also have extinguishers on the upstairs landing, in the genkan, and in the kitchen. Why? Because I've always been worried about him cooking after drinking! Hence my just KNOWING it would a pot on the stove in the kitchen.