Hopefully you have a handle on the problem with Ginger. I have noticed in the past with both the animals, and ourselves if one of the occupants of the house becomes stressed it's like the flu, it goes and will affect the rest of us. For some unknown reason we humans don't seem to pick up on this problem. If you're adding a bit of the Rescue Remedy to their drinking water it will help calm the other cats as well.
I'll keep my fingers crossed for the continued success with Ginger's stress problem. Getting a good night sleep means so much to us as well as the cats.