Here is a link to for anyone who has never experience vibrations during sleep paralysis. (hopefully it works)

http://www.lucidology.com/obe-quicks...dology-com.mp3

This is exactly how is sounded for me a few months ago when I entered sleep paralysis in the middle of the night on accident. It is really loud, it sounds like a train is going over you and for me it felt like I was accelerating horizontally really fast.

Experienced LDer's, please correct me if this isn't what vibrations are, maybe I'm mixed up and this is a different phenomenon.

For people that have experienced this, Is it spot-on from your experience?