the difference between heaven and hell , page-7

If heaven is a state of purified mind, & hell the variable state of a cluttered mind (of unfulfilled desires etc.), what role does the Dark Night of the Soul play in rectifying a mind of lower level consciousness (hell) to a more heavenly state of mindfulness ?

Does the Dark Night release a flood of "samskaras" from the cellular structure of the body, or a multitude of "impressions" embedded in the subconscious, into the consciousness; a "flood" that is thus experienced as acute Suffering - which can last for several years or, for that matter, a score of years, as the mind is emptied ?

Does the process of the Dark Night bring with it any worldly benefits or does the person "chop wood, carry water" prior to enlightenment & "chop wood, carry water" post the purifying process ?