My dog keeps having seizures. What does this mean?

Our dog, & 4 year old Yorkie, has had “seizures” for 2 nights in a row, but has seemed fine afterwards. I’m not sure if they were really seizures, because they all happened while I was asleep. My mom says he stopped breathing, & called it a seizure.

They won’t take him to a vet, because it costs too much. I’d take him, but I have no money & can’t drive.