Get some motion sensors from Harbor freight. I bought three and all three are different codes so one sensor doesn't activate more than one receiver. When I am having problems with raccoons visiting our patio and causing havoc I simple set one out there on a cat litter can facing the sky. I put some peanut butter and a couple of marshmallows on top of the litter can. When bandit shows up the sensor wakes me and I put a pellet through his brain. By putting the sensor on the litter can facing up the stray cats won't set it off when walking by. If you need a little light you can always place one of the freebie lights from HF to aid in the shot.
Interesting. Now I don’t intend to fall asleep while pesting, but I am curious. What type of system do you have that wakes you up? What are the sensors connected to? You mentioned a receiver, but I’m absolutely clueless about this set up. I’ll look it up on Harbor Freight’s site. This sounds perfect for my garden. May even try it around the chicken coup.