Where I live, my defensive weapons are my perimeter alarms and my cell phone.
I keep a notepad and several pens for the police officer in case he leaves his in the car. He will want to start his SOCO report as soon as possible.
I also keep a camera at the bedside so that he won't have to drive back to the station to get one. It's important that the photos be of very fresh wounds.
A pen at the bedside might be considered a lethal weapon in Ontario, so I keep them in a separate location. My wife knows the location in case I am killed by the intruder.
Fortunately, I sold my SAAB some years ago. In Ontario, acquistion and possession of a SAAB would probably be construed as intent to kill. This would mean an additional lawsuit from the intruder-victim, should I have made the mistake of defend myself and my family.
When I'm in The States, it's a Glock G22 with night sights, Speer Gold Dot 180 gr. hollow points and a Surefire. Loaded with one in the pipe.