I've had sleep paralysis but have never seen a figure. In fact, I've never seen anything because my eyes were always closed and could not open during my sleep paralysis. I've also went through a phase quite some years ago where every night, sometimes more than once, I'd become paralyzed.
With this said, what is the difference between different types of sleep paralysis? Why do some people see a man in a hat versus other images or nothing at all?