image from yourdreaminterpretations.com
I enjoy the perspective this particular mystery brings. I am sure there is a "scientific" explanation for the areas of our brain that we are and are not able to access during the lucid dream state. But the way I think about it is: What better way to widen our sphere of self beyond a specific set of spacetime circumstances? Repeating this experiment never ceases to delight me.
In the words of William Blake, “If the doors of perception were cleansed every thing would appear to man as it is, Infinite. For man has closed himself up, till he sees all things thro' narrow chinks of his cavern.” We dream even as we walk waking through the daylight. Lucid dreaming is sunlight ripping through the cavern. It alights a stable entrance in its illuminating way.