Questions from 10 Days Mr. Goenka Vipassana Course?
Give not importance to any of these experiences. They are just conditioning. If you give importance of have prejudice towards any meditative experience, you might end up generating aversion and craving. 

What these experiences could be:


you are more sensitive to these vibration
Piti or sukha has surfaced
vibrations are part of the Mahābhūta and you mind is becoming sensitive enough to experience it
other past Sankhara manifesting itself as vibrations (above included)


When you get such an experience try to see the arising and passing nature of it! This experience, as with any other experience, in essential you your practice of equanimity. Whatever your experience be equanimous - this is the exercise and what you should be doing.


  I saw a Dog, Snake and Centipede before sleeping, as soon as I closed my eyes.


People have odd dreams / day dreams. I am not sure what this means. Buddhism does not deach how to interpret dreams.

Like anything else, do not give any importance. Be equanimous.

Also there is a lot more of what the Buddha taught than what is taught in a 10 day course. The Tipitaka is very vast. This contains all which what Buddha taught.