I'll try to tell how it happened to me. I went to bed around 4 a.m or 5 a.m can't remember correctly. I woke up around 10 a.m to say bye to my boyfriend cause he was going to school. After that I went back to sleep then I started dreaming. In the dream, I was standing behind a house in the backyard looking to a black sky full of stars and I was "trying" to see different lights (flashlights) in my dream it was suposed to be some kind of alien signs. Eventually I started seeing some flashlights and they started getting brighter and brighter and suddenly I opened my eyes with a very very bright light and after some seconds I could slightly see the wall that is located beside the bed. While seeing the wall I was hearing that horrifying continuous loud sound and I was really trying to move my body but I couldn't. I kept trying, I remember I could only move my finger a bit but I really felt tired from continuosly trying to move. After some seconds I slowly got my movements back. I checked my phone and went back to sleep. At that moment I was like "What the fuck just happened ?". It was the worst thing ever. I couldn't see any ghost or monster whatever but I was in extreme panic, feeling a mortal fear. It felt like I was being abducted lol. ugh I don't want to have this again 
There are a lot of information about sleep paralysis, lucid dreaming etc. I've been studying it for a while after what happened to me. It's quite interesting.
There are a lot of information about sleep paralysis, lucid dreaming etc. I've been studying it for a while after what happened to me. It's quite interesting.