I had this really bad once last year, I woke up suddenly and could feel something wasn't right.
I was lying on my back, arms side by side and this dark shadow in the shape of a person started slowly moving towards me from the top of the landing through my door and next to my bed. this felt like the span of an hour or so. I tried to move but it felt like dan said, an over whelming g force. it feels scary real and you cant do anything about it.
only way I got out of it was just closing my eyes and sort of 'sending the vibes out there' to the entity it wasn't welcome?? woke up fully after this literally dripping in sweat and a bit confused
another common one I have experienced is the same paralyzed state but with some kind of goblin figure on your chest either sitting on you or jumping and just doing the average goblin shit idk something like that
Its an interesting phenomenon seeing as there are so many of people reporting the same thing, something to think about ay.