Well the way to check if they are dreamers or members of your subconscious is to either do something to get the persons attention then just ignore them, walk away and stop thinking about them. Dreams are made of energy, everything in a dream is energy. Focus is energy. When you ignore something that requires your energy to exist it will cease to exist. That ncludes DC’s. But an actual dreamer doesn’t need YOUR energy. So if you ignore the dreamer he/she will continue to be there. Another way is to just talk to them and see if the conversation makes any sense, DC’s talk in circles a lot, or they use gibberish, if they say anything logical you can probably finish their sentence midway because it’s probably something you say a lot. A dreamer will talk the way they usually talk, especially if they are lucid.