and you now have a very-tired-cat. There was no smoke. There was no fire. The battery may need changing. I don't know. It went off twice - both times quite briefly.
Of course the battery changing business is not one the Senior Cat and I can handle. He can't climb a ladder to get to the alarm. I can't climb the ladder either.
There will be the usual battle over whether or not it is proper to ask someone such as my BIL to do the job or call in the electrician to do it. The Senior Cat hates asking other people to do the jobs he could once do. Middle Cat will explain gently that is is "perfectly all right" to ask in such circumstances. The Senior Cat will mutter and grumble.
The smoke alarm is located in the passage way. It is very sensitive. If I am using the oven I need to shut the intervening door before I actually open the oven or the smoke alarm is likely to sing a raucous song. The noise is ear achingly loud.
My bedroom is located adjacent to the smoke alarm. I leapt out of bed of course.
The Senior Cat slept on. I know because I have just asked him whether he heard it. I thought it was unlikely because he didn't come out to investigate last night.
I am glad he was asleep because he is a restless sleeper - but it worries me that he didn't hear it.