I had a dream within a dream the other night. I don't remember the subject, but I remember waking up and thinking that I had been dreaming. Then I actually did wake up and realized I had a dream about dreaming. I wonder how often that happens. I don't think it's ever happened to me before.
I did, however, once have a dream where I was aware, on some level, that I was dreaming.
I frequently have dreams about being back in the Army and back in Germany. In these dreams it's usually present day and I realize that I either didn't retire or that I joined back up after retiring. In my dream I'm not happy about it! And I'm always missing part of my uniform, or I only have one uniform and need more, or my uniform(s) is in the wash and won't be ready on time. I don't like these dreams.
One night I had one of those dreams and, during the dream I said, "Yeah, this is the sort of dream I don't like." So I knew on some level that I was dreaming, but not on a level that let me control the dream. I think that's called lucid dreaming - where you can control your dream. What fun that must be!!