In order to leave this realm of experience, the higher-self has to take all it has learned in all of its "lives" and "process" it. It can't leave the life energy behind. they act as anchors.
these absorptions can occur in several ways, but the most common are via dreams and the second most common way is to have the previous life resurrect in your conscious now while you are alive.
if you are having dreams you are dying or committing suicide, it's the higher-self processing previous lives and parallel lives as it prepares to move on to the next level of existence opportunities
it helps if you align your chakras. The easiest way to do that is to do the 5 Tibetan rites
there are a lot of youtube videos that demonstrate how to do them
Your higher-self is "playing" many lives simultaneously as a way to improve its odds of one of the life times achieving its eternal objectives.
However, once one of them gets close to achieving it, it focuses on that one and as a result has to absorb the energy it has invested in the other lives to focus more on the one that is being successful, The downside of this is it will not tolerate you "straying off course and will make your life miserable if you do as a way to encourage you to get back on the right course.