I don't often feel vibrations, for some reason.
With a good WILD attempt, at some point I will feel that my body is completely relaxed. Sometimes I feel a "wave" of energy, or something, go through my body. Then I am able to move an arm, or my whole body without any effort, but it's not my physical body. Then I either sit up, roll, or float out of bed and go about my lucid dream.
sometimes a dream scene will form around me and I'm suddenly somewhere else.
It's an amazing experience, to be sure.