> Once we have crossed the Arising and Passing Away (and if we don’t suddenly die or get severe brain damage due to some unfortunate life circumstances), we shall enter insight stages five through ten regardless of whether we want to. It doesn’t matter if we practice from this point on; once we cross the A&P, we are in the Dark Night to some degree and become what is sometimes called a “Dark Night yogi”, or simply “darknighter”, until we figure out how to get through it. If we do get through it without getting to the first stage of enlightenment, we will have to go through it again and again until we do. I mean this in the most absolute terms. It appears to be a hardwired part of human physiology as far as I can tell. I have a very large and growing body of case studies and a wealth of shared experiences among meditation friends and acquaintances to back this up, and I am not alone. Tens of thousands of meditators have noticed these stages in their own practice and countless teachers have noticed them also.
Daniel Ingram, Mastering the Core Teachings of the Buddha
https://www.mctb.org/mctb2/table-of-contents/part-iv-insight...