There are a lot of interesting posts here. And up until today, I had no idea that this thread existed.
ON the subject of memory, I must be a bimemual.

My memory functions visually, and as spoken text-based.. (Like Av, I don;t actually see the words, but I hear them in my mind, as if I am talking to myself.
The easiest way for me to explain it is if I were watching a movie with subtitles, but instead of the subtitles appearing on screen, they are being narrated.
But this is not a mutually inclusive or exclusive process. Sometimes I think/remember only in words, other times only in images. The strange thing is that I can vanquish the images, but not the words. When trying to clear my mind, I am always hearing my mental instructions, and never is there silence. (It is very difficult to describe, because I'm not actually "hearing" anything, per se.)
Sleep/wakefulness is also binary for me. I am aware of nothing while I sleep, and the passage of time is meaningless. But when I awaken, I am fully aware that I slept for either a long time or a short time. I dream, but not often. .(At least, I don't often remember that I dream or what the dream was.) My dreams are completely audio/visual. I can see and hear everything that my mind plays out. But I cannot feel, taste, or smell anything in my dreams. It is almost as if those senses don't exist in dreams, as if the part of the brain that processes that information shuts down for my dreams.
Only once have I awoken from a dream and felt as if it were real. In that particular dream, I was being sandwiched by countless semis (18 wheelers). I awoke just as they were closing in from either side, and passing me in opposit directions, and constantly getting closer and closer. It took at least 30 seconds after I knew I was awake for the trucks to stop driving by and my physical vision to take over. BTW--I have died in a dream....and I am still here.
For the most part, my dreams and my reality are seperate, and even as I am dreaming, I
know I am dreaming.
What's strange is that as the memory of the dream fades, the "subtitles" get sharper, while the images become more obscure.