The 'viberating stage' is known as Astral Catelapsy. I used to experience this along with not being able to move or speak. now what I do is let it run its course, and tell myself 'I wish for a smooth exit and re entry' I make myself relax. Kind of like the forceful relaxing you make yourself go through when you get into a hot bath, but the waters a little too hot, but you get in anyways and even though it could be very uncomfortable, you make it very relaxing. I hope I'm not being confusing.