Sleep paralysis on purpose?
I'm very interested in sleep paralysis, the real sleep paralysis (not hypnagogia). I experience it very occasionally, just once or twice every now and then. Usually there's not much to it besides the feeling of being stuck but sometimes pulling out of my body into a non-physical one for a moment before snapping back and some visual data from my room being skewed or misinterpreted, but recently I've had a couple more significant ones. One was in complete darkness and I felt an entity approach me and start pulling the sheets off of my bed, and the other had the air bending and twisting and there was a humanoid demon with empty eyes staring at me from the foot of my bed. I've also had a few interesting hypnopompic experiences where I wasn't paralyzed but I did continue to dream after waking up; each time I had short imagined conversations with my friends before they faded away. I have a lot of interest in these as well.
So, my question is, is there a way to cause these experiences on purpose? I'd really like to be able to explore these states more without having to just hope they happen from time to time.