I had only 4 sleep paralysis in my 27 years of life and I pray to heavens that I never get any.
I remember all of my sleep paralysis vividly. The fear is so intense, it's not the usual one but a menacing fear that something is up to get you.
My first sleep paralysis was a tall shadow. My room was pitch dark yet the dark shadow was distinguishable since it was right by my side, looming over me next to the window. Then, after what seemed to be eternity it disappeared through the wall, bending while leaving. It wasn't a nightmare, it felt so real.
The next time there was something on top of me, scratching my stomach and attempting to I guess to get to my organs. And there was someone whispering something in my ear.
Then the 3rd and 4th time there was that shadow again.
I didn't know anything about SP before my first experience and when I searched online about the shadow, the realization that there were so many people that experienced the same thing of not being able to move and seeing the exact shadow, instead of consoling me it made my skin crawl. I had troubles falling asleep for a week.
the SP in my case was lucid dreaming. In 3 out 4 cases of SP, it was the after result of lucid dreaming. It doesn't happen always but there's no way that I will take any chances. Shame though, lucid dreaming is one of the best things I've experienced, the feeling of absolute freedom where imagination has no bounds.