Ok thats stupid. The Logical side of your mind is not shut down during dreams or lucid dreams. There are plently of people who actually found mathamatical answers in there dreams and were able to use them in real life. There are some who read books in their dreams and remembered them when they wake up and came up with great novels. Logic simply isn't the language of the subconscious mind, nor is numbers, or letters, the mind likes to speak in images and language (it likes to speak in symbolic terms)... This may be why numbers and letters can sometimes be random... simply because the mind doesn't have much use for them. Cohesive books and words/sentences are easily achieved by simply commanding the dream to come up with a comprehensive and stable book. Your mind is not limited by any respect, and I'd like anyone to try and prove me wrong on that.

As a note: I can remember my name and e-mail in my dream, I know this for a fact because I state it to myself if I feel I'm losing consciousness in a lucid dream. I can remember anything I want.... I believe the explaination for forgetting these things lays in the fact that we're experiencing a completely different and wonderful reality... who wouldn't forget the dull ordinary reality? (We create alternate lives in dreams... it's hard to remember another life on demand).

Also as for the previous post before mine.... YES YOU CAN EXPERIENCE ABSENCE OF IMAGES. Many people have seen absolutely nothing, hear nothing, and think nothing but "i exist" in there dreams... If you were to think nothing at all then yes your probably dead or unconscious in N-REM or something... But it is possible to that extent.

As said, You create your own limits, In a dream any experience is possible... even the experience of nothingness.

-Daniel