According to Osho, 'descent of kundalini' is not a literal downward motion; in truth, in the kund all ideas of up and down dissolve—like a drop merging into the ocean. Practically, descent means returning excess awakened energy back to its source when it exceeds your capacity, to prevent damage. Hence cultivate receptivity first—build the vessel, canal the dam—so forced, sudden awakenings (high voltage) aren't needed.
It’s not really going down; if too much inner energy turns on, you gently send it back and first make your inner container strong.