Every so often (usually when I can't sleep) I get up and grab the pistol suddenly, as if awakened by a noise. I then clear the apartment with a little help from a flashlight. (loaded, off-safe DA, same as if there was a real threat)
I also practice clearing in other scenarios with toy guns.
I learned that the staircase in my 2-story apartment/townhome is a great place to make a stand if you get there first, since it is very hard to go up the stairs while watching for someone and being prepared to shoot accurately.
I am also working on setting up a ghetto-rig alarm that will set off a buzzer in my room when the door is opened. When I finish that, I might rig it to come on at some random time in the middle of the night, for a realistic wake-up-and-clear.
Now being able to shoot live ammo in a real house in a realistic scenario would be cool! Nothing like that that I know of around here.