Dreams

Dreams often refer to a phenomenon in which animals have a good deal of brain activity while they are asleep. Within this brain activity, animals with brains can experience their subconscious life in worlds of dreams. That is, it qualitatively at that time often feels like being awake, however, the person is not awake, and anything that has happened in the world of dreams has in fact, most often, not actually occurred in the real world.

Dreams can range from being exceptionally dreamlike (and not even being remembered) to being quite vivid.

People can even wake up inside their dreams, and be aware that they are dreaming, while they are dreaming. This is called "lucid" dreaming.