Caspian never tells anyone, because they'd think him mad, but Peter visits him in his dreams. He's quite sure they're not normal dreams, because Peter argues with him and tells him not to be foolish and gives him advice on ruling a country and counsels him to find a wife soon and have heirs, not to make the same mistake Peter did.

When Caspian tells him, "I don't want a wife, I want you," Peter just smiles sadly and replies, "Surely by now you know that what we want has very little to do with what actually happens.