Why do smoke detectors always go off between 2:30 and 3 am?

I've noticed that too, except mine go off like at 4am.

I'd buy new ones. They shouldn't be going off.....

It sucks I was in a deep sleep.

It depends on when someone decides to start the fire. Just ask them (politely) to please start their fire at a more convenient time. Problem solved.

because you dont wait till later to put the new batteries in

LOL this place is a rental I called the front desk and they told me there was no fire well no really?

OP, how did you find out about it? A neighbor called you? Front desk? Or your super GPS-and-satellite-enabled smoke detector called you up?

But you're right. They do always go off in the middle of the night right when it's scariest and you are in the middle of deep sleep. My guess is that it has something to do with the cooler nighttime temperature reducing the voltage just slightly in an almost-spent battery, down to "OK, time to change battery" level.

Maybe GPS and satellite modules aren't enough in your smoke detector. Maybe you need a clock module too, so that it will hold back with making a sound until after 7am.

Maybe it was the temp its about 74 in here I don't know what is it outside its Florida though. Now Im wondering does carbon monoxide make them go off? I'm kinda dizzy and seeing white in my peripheral.