Albert Taylor who was also a NASA Engineer wrote this book on Astral Projection.
His experiences stem from Sleep Paralysis just like mine. He had this Extreme Relaxation technique that brought on sleep paralysis and then the vibrational Stage , you have to check this book out!
https://inhousereadzz.com/products/soul-traveler-a-guide-to-out-of-body-experiences-and-the-wonders-beyond-by-albert-taylor