i had my first one when i was five, it was pretty violent, my body levitated up and down after i shook very hard. my poor mom was terrified, the second time it happened i was in my late twenties, that time it was the most relaxing energy i have ever felt. i did not try to do this awakening, it just happened.
my friend was over the other week and we were talking about spiritual stuff and i started to feel a vibration with in me, but i did not shake on the outside, i told her this and she said this is what she feels when the holy spirit is with her. she said she was feeling it right then.
very interesting. one day i look forward to communing with her when the vibration stops and she feels the calm, the stillness of the "holy spirit"