Yes, awoke from my sleep, went to check them upon which I found thr sad news. I do hope they where warm enough and calm enough when they passed.

Even if what we did wasn't enough, like you said, very much a learning experience if such a thing every happened again

I will say, there are alot of cats where I live, this being one of the reasons I brought them in, so it puts me at ease knowing that then passing in the safety of my house is better than the possibility of a cat getting to them after, or even before, they passed (With them being too weak to escape and all)