What firghtend me most was the idea of having frightening hallucinations. I dident have any though, except sounds. Listeing to music sounds great! hope to try it out som time 
From what i know SP is totally harmless and happens every night when your dreaming: https://community.ld4all.com/t/what-is-sleep-paralysis-and-its-causes/7497
I have felt simular vibrations. But I dont know what they are. Kinda simular to what happend this morning when i got SP. There where moments when I could feel both my dream body and real body at the same time. I moved my dream body and was aware that my real body didnt. Wierd