It depends on whether I'm in the city or the countryside, and how cold it is outside.
This happens often during storms on the countryside, and it can take days, so I'd have to try to check on the food and if there's stuff in the freezer and such...
If it's in the middle of winter, I'd find some extra clothing etc. And if it looks like it can last a while, close a part of the building, move my bed to the living room, and only heat that room with the fireplace.
If in the city, I wouldn't be too worried, since it would be fixed soon.
In both houses we have flashlights and candles to be used on such occasions, so first I'd go where the flashlight is always kept, for such situations.
Ieyke said:
I'd continue as I normally would if I was without power in broad daylight.
I have exceptional dark vision, I'm used to navigating cluttered basement/garage-esque spaces in pitch darkness, and I am dead certain that I'm the scariest thing that lurks in the darkness.
I'd... I dunno. Clean my house? Rearrange furniture?
*shrug*
It's impossible to see in perfect darkness. Granted, midnight, depending on where you live and the time of the year, might have plenty of sunlight, but during winter? And when the city lights are out?