I say goodnight to my cat every night. She was feral when I kidnapped adopted her and she still has some of those tendencies. One is not sleeping in my bed. If I sleep on the couch, she’ll sleep next to me. If I’m in my bed she’ll occasionally jump up to check on me. But she doesn’t sleep with me as a rule.
So every night before I turn out the lights I tell her it’s bed time and say goodnight.