Welcome back to SL & KC.
KittyCatS don't die, so it's totally normal yours didn't. Although they don't die, they get sick after 3 days without food, which is probably why yours "keep sleeping" (and are more than likely under a blanket).
To heal them you have 2 solutions : either feed them normally and they will recover in 1 week, or give each cat a "get well" vitamin (as well as food, of course) for instant recovery.
There is a manual on this website where you will find answers to all your questions : https://kittycats.ws/manual/
Hikari
Returned to Breeding
