My guess is that you're not glowing - you're reflecting. Most of the cameras that take night shots emit an infrared light, much like a regular camera flash - only not visible to our eyes. Just like a camera flash lights up the scene by reflecting off everything, the IR light does the same, only without scaring the wildlife with a visible flash.
So, the camera is not gathering the IR that your body is emitting, it's gathering the IR that it emits and is reflecting off your body.
Make sense?