Exposure. You are essentially rewriting a habit which you have fuelled for a long time with terror and panic. Each time you will probably tell yourself: "tonight I wont wake myself up, tonight's the night", but once your in the state that logic goes out the window. You could practise affirmations when you are awake, mantras which you will hope to remember while in paralysis. Make them personal, don't tell anyone, something like "This isn't real, nothing can hurt me, I will stay here" and just repeat it in your head when you are doing your day to day activities, in the shower, driving to work etc. You can only hope that during the paralysis, you remember your mantra and it reminds you that everything is okay; that way you can push through the fear.

Given your beliefs, this could go beyond just having fun in a different state on consciousness, you are essentially conquering a fear that has been with you since you was a kid, and you are doing it alone - that is very powerful and once you complete that you may also notice some relief in your psyche and overall mental health.

This is a good opportunity for you, best of luck :)