In such a dream, you can soar upward, moving left and right through space, gliding up off the ground. As real as it feels, down and up and left and right are all your dream-feelings. The space in which a dream takes place is altogether a dream-space. Up feels more open than down. Directions have feelings associated with them, and they are mostly the same feelings whether we are awake or dreaming.
Many people confuse left and right while awake or dreaming, for instance while driving a car.
While driving, you have probably confused left and right more often than you have confused forward and backward. Left and right are barely distinctive compared with forward and backward, or up and down, which people rarely confuse. Brain damaged patients, as well as non-human primates and mammals, often can't tell the difference between right and left at all, whereas up and down are quite firmly established and frequently emotionally charged. Although a few human cultures use their right hand for greeting others and their left hand for cleansing themselves, many more cultures have very strict and almost universal rules concerning up and down. Up is, almost universally, where heaven abides.