Originally Posted by cyphertext

While I agree, I don't believe the OP is at the level to respond to all of the scenarios that could happen. At this point, I think he is looking at the bump in the night awakens you scenario.

Really, home defense should be several layers. Motion detecting exterior lighting as one layer, or deterrent. Landscaping that dissuades someone from accessing windows, making sure all windows and doors are locked, alarm systems, dogs... all these things should come into play before the gun... Make your home appear to be more difficult to get into than the one down the street.