Have you ever had a dream where you, in a way, knew you were only dreaming, but in the dream you noticed something that felt like it didn't belong there? You know, like it was something or someone else that was real, like you, and not part of the dream itself. From what I can remember, it has only happened to me twice, in two separate dreams.
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I've had dreams like that, where I'm technically awake, but still lying in bed, dreaming. Each time, I was aware that the characters of the dream weren't real, but they were still more lifelike than in any other dream.