Oh, yeah, it's a bunch of random imagery and sounds your subconscious shows you, but it's not just imagery and sounds, there's often a coherent narrative, and you get memories and feelings in there too, so it's possible to just "know" things about your dreams without being told or observing them. Also you can manipulate your dreams at will; just thinking about changing the environment around you can make it so. No I'm not making this up. Yes, it happens every night. Where are you going? Get back here!