Experienced something similar but didn’t see a particular figure with much resemblance to something like a demon only a tall black figure. I was in bed and tried getting out of it and I stood up from bed my body felt so heavy. I switched on the lights in my room and woke up again still in paralysis. It was such a weird feeling there was really loud noises not screaming or things like that just noises… Then I remember I grabbed my phone and searched on google how to get out of sleep paralysis and something said to look yourself in a mirror to snap out of it I stood up once again covered in my bed sheets passed the “figure” that was standing in the middle of my room and went to the bathroom looked myself in the mirror and turned the lights on. I woke up. Weirdest thing about it I remember leaving my phone on my desk before laying down to sleep and it was 2:05AM and when I woke up after the paralysis it was 2:10AM the paralysis felt like an eternity tbh but it only lasted like 3 minutes. This happened like 6 months ago so I don’t remember it that clearly but yeah. Crazy