As luck would have it, I've got enough hearing loss where I don't hear too many noises at night (or any other time of day, lol).
But I do know that many appliances cycle and when the switch trips, it can sound like a snap, a click, or a small bang.  And in the quiet of the middle of the night, it can resound around and seem louder than what you hear in the daytime.  Anything electric can do this. 
I'd been wondering for some time about a clicky noise in the kitchen that I'd hear every once in awhile.  I narrowed it down to the area around the stove.  Just the other day discovered that the burners on the glasstop cycle on and off while they maintain the heat, and that was the clicky noise.  It happened just as the burner turned red again, and again when it turned off.

Hopefully you'll figure it out!

ghost  :zno really im leaning toward raccoon