Fister has had nightmares a few times, so it does happen. One night a few years ago while he was sound asleep in the bed, he suddenly jumped in the air, growling and acted as if he was in fight with another kitty - he had been down in the yard a few days before that and confronted an "intruder".

Hopefully, none of them will have any more bad dreams!

A good cuddle right after should help.