Do you mean, during an astral projection attempt, or all the time?
If you feel them during projection practice, yes it's normal. I felt them every time for a month or so, several weeks at least, before I achieved my first consciously directed projection.
If you feel them all the time, it's not commonplace to everyone, but you probably just have excess energy. If vibes like those felt during astral projection occur outside of practice, in daily life, you can either center and ground the energy, or focus yourself on some creative task. Either choice will channel the energy elsewhere.
Alternatively, the vibrations can be caused by an astral body that is not quite in sync with the physical body - in this case, it helps to do some physical task like yoga, sculpture, even playing video games can help, anything that requires mind/body coordination.
peace
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The world is complicated - that which makes it up is elegantly simplistic, but infinitely versatile.
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