it is possible to dream u know u are dreaming.i call that becoming aware im dreaming.Also as to not being able to speak,remember u are dreaming and its your dream so u dont have to speak.its like projecting your thought.dont say i want this to happen,u are dreaming,think that its happening and your dream will change.no need for speech.i call this my verbal projection.i dont even know if these two words exist but thats what i call it. I project what i want to say.verbal projection.