Wait guys when i feel that strong shaking should i go along with it or should I try to stop it, because last night i was so confused I kept trying to stop it because i couldent tell if my actual physical body was shaking or it was all just in my mind. I didnt want the shaking to wake my body up....
It's not your physical body. If anybody was looking at you, he would not notice a thing. I believe, that vibrations are your subtle dream/astral body separating and getting ready for the nightly adventure. It could also be the energy body expanding to receive energy recharge from the universe.

Everything vibrates. When we raise our vibrations, that's when we are able to visit other realms like dream and astral, because those operate on higher vibrations. I also believe, that what level you raise your vibrations to, that determines, which plane you are able to visit. For example, if your vibrations are good enough only for lover astral planes, you will not be able to visit the highest planes. It's like tuning a radio. You have to be on the right frequency, to receive certain channel.

If you stop the process, you will just fall asleep and the proces will start again after you are asleep. Or you can try again and you may get the vibrations back.

If you read the article I linked, you will learn that you can have all different kinds of sensations, vibrations are just one of them. Let them all play out.