Steve/Elcano's idea is exactly what I am currently using. I had a couple of X10 Motion sensors outside my house, near patio, masterbedroom, etc. I have a rule like this:
Whenever system armed, and time is after 11:00pm
If motion detected (by X10) outside, then turn on Task #1
Task #1
Turn on Patio Light, Turn on Kitchen Light, Turn on Masterbedroom Light, Sound a short beep.
The only thing I might change is to get some outdoor motion detectors that is more reliable than X10.
This I think is better than trying to detect motion in-house when it's occupied. You never know what night you might be up and trip into the motion detection area (in my case, kitchen/family room).
Whenever system armed, and time is after 11:00pm
If motion detected (by X10) outside, then turn on Task #1
Task #1
Turn on Patio Light, Turn on Kitchen Light, Turn on Masterbedroom Light, Sound a short beep.
The only thing I might change is to get some outdoor motion detectors that is more reliable than X10.
This I think is better than trying to detect motion in-house when it's occupied. You never know what night you might be up and trip into the motion detection area (in my case, kitchen/family room).