CFTraveler,

Thank you very much for clarifying so much, it seemed that I approached and worked with these files the wrong way.
I always thought that I need to work with them on the brink of collapsing into sleep. But based on what your wrote I can work with these files at any point of the day and the goal is to bring my self into a deep state of relaxation and then deepening it by entering into a trance state. Feeling extremely sleepy is not necessary (so it seems)

just trying to get you to a deep enough trance that you go into a transitional state.
I need to do some proper research about this transition state you mentioned. So that I can recognize if I reached such a state. Would you say that feeling a certain energy flowing through your body and some sort of numb/stiff feeling in the arms and legs can count as such a state?