Weird Electrical Occurrance

This morning I was sound asleep when I was suddenly awakened by a popping noise and flash of light. There was a slight smell of smoke, and while the smoke alarm did not go off, the red “alarm” light on the smoke detector flashed for a few minutes, before returning to normal.

I checked it out, and all my lights, appliances etc were working fine and none of the breakers were tripped.
The room has recessed ceiling lighting on a dimmer switch, and none of the bulbs are burned out and the dimmer is still working. Since I was asleep, none of the lights were on at the time. What could have caused this, and what is the worst case scenario here ? Its been a few hours and my apartment hasn’t burned down yet. Thanks for any replies – Its making me pretty paranoid.