Ahh good old night terrors. I've been getting these randomly on and off since I was 10ish. The first time I had it I was staying in my dad's gfs house for the first time ever which was this big creepy cottage. I woke up in the middle of the night not being able to move and with a feeling of someone or something ontop of me pushing me into bed. I finally snapped out of it and turned the lamp on and obviously nothing was there.
Having never heard of SP before, I instantly assumed it was a ghost and refused to stay there. I continued to experience it over the years, in different forms. Sometimes I could just see someone stood by my bed watching me, I could never see their face though and couldn't move at all.
2 years ago during summer just after my 1st year at uni, I got myself a nightshift job. The pay was good and as it was only for a few months I thought I'd be able to hack it. However, towards the end of it I suffered from sleep paralysis multiple times EVERY time I went to sleep, it was terrible. Apparently a dramatic change in your sleeping pattern can cause this. I still get it every now and then, mainly if I sleep in really long, and it's always the same thing now and it's horrible. I can hear someone sprinting up the stairs/along the corridor, laughing like a total maniac before coming into my room, then I can just see them standing there but again I can never see their face. It's scary how real it is, still hate it.
Best way to get out of it is to wiggle your toes and start breathing really fast.