Well, residential apartments don't have fire drills ever, certainly not in the middle of the night. Or if they do, I'm not living in them.
That said, could have been some jerk pulling an alarm, or smoke in a hallway or apartment setting off the alarms. Sometimes it can be something really trivial. One time a circuit board fried in our central heating unit, and that set off our smoke alarms -- even though there was no discernable smoke or vapor.
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