I have a smoke alarm (Kiddie) that is beeping regularly (every 30 seconds or so), what I would typically associate with a low battery. The strange thing is that the beeping is only happening between 5 and 8 in the morning, and I'd like to understand why.
It starts beeping when there's nobody downstairs, and it's in a back room with no close heat sources - the boiler and water cylinder are in a different room. The only thing I can think of that has changed is that this time of year the sun streams through my utility room and into the back room where this smoke alarm is located. It's on the ceiling so it gets no direct sunlight of course, but the light shines on the floor directly below it.
I've replaced the battery, so I'm not looking for advice on how to fix it, I'm curious as to what the mechanism is that's causing it.