Whenever I have really deep meditations I get lots of vibrations all over. I don't think it's only to do with having astral projection. I get them also when I do my chakra cleanses. But instead of having them through out my body I have them in the chakra spot that I'm working on at that moment and then grows and follows with each chakra I work on. I've always seen it as energy building up and flowing around. Also with the vibrations, for me at least, usually comes heat. I always get really warm when the vibrations come.
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