One of your answerers mentioned that a sleeping person has an unconscious mind, which should be modified to being asleep and not dreaming. Other than that it sounds good, along with instances where one has lost consciousness as a consequence of some sort of physical trauma. Professional boxers are familiar with such things --- especially serious losers of professional bouts.
Of course Freud is the alleged "discoverer" of the subconscious mind, although most ancient Greek sophists, along with Socrates, Plato and Arisotle, all knew that most human beings were not directly aware of the contents of their own minds --- even waking minds. Thus Socrates's alleged "midwifery" of the thoughts of those he was questioning or with whom he was "dialogueing". A lot of his dialogue partners seemed to think that they knew things which they actually didn't know, whereas some, fewer, people who clearly did not know things (like Geometry in the case of Meno's slave) seemed to know things that they couldn't possibly know [Geometrical Squaring in the case of Meno's slave].
Later on, Aristotle argued that Socrates was actually teaching people [despite his protests to the contrary in the dialogue Meno --- See Meno I am not teaching your slave anything --- only asking him questions!] by asking them good sorts of "loaded questions", where a question can be rephrased as an actual assertion.
Of course bad sorts of "loaded questions" are like "Have you stopped beating your dog (wife, husband, child, neighbor etc.) yet?" If you answer "No!" you are still a dog (or etc.) beater. If you answer "Yes!" you WERE a dog (etc.) beater or abuser.
Socrates actually asked the sorts of questions where he gave his dialogue partners the principles by which they could do their own reasoning about philosophical questions --- as long as they honestly tried to answer his questions and didn't become frustrated by their previously mistaken answers.
We become aware of the subconscious aspects of our minds, when speaking or writing our mind's contents, or by our behaviour, or actions, with or without concurrent spoken behaviour. Thus Freud's so-called "talking therapy". Similarly Plato's dialogues, involving back and forth talking between Socrates and a dialogue partner/s.
Freud, Plato and Aristotle