I'm not sure about you, but I can tell the difference between a dream and reality.
At the time of dreaming I may not necessarily "know" that I am dreaming, but the experience of dreaming is so completely different from waking, I don't think that I could say that when I am dreaming I "think" that I am awake either
Regardless; with hindsight, I can tell the difference between what I dreamed, and what I experienced.
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