yes, I think that some people forget that sort of thing when they get excited and wrapped up in something neat and fun like lucid dreaming.

the mistake, I think, is to forget that the outer world works by certain rules (ie: gravity. don't break that rule&#33 and conventions (ie: if you're not nice to people, they tend to lash out at you).

the inner world is different from the outer world. the two realities only intersect when you are awake and interacting with the outer world.