I had my first spontaneous OBE about 6 months ago, and then a "swarm" of them over the xmas new year period, then they started happening less and less, and each time I would have less energy than the time before - to the point where I would exit, then float to the 'floor' like a feather, and not be able to move I was so weak. Then nothing at all for the last 6 weeks or so.