Did you ever have a tingling feeling in your arm or leg and you kinda lost the feeling of your limb, it feels like a million little "needles" are puncturing the limb. I bet we all try and shake the limb or try and walk, but if you shake your head you can ALMOST always "wake up" the limb :)
And for the introduceyourself, I think a lot of us were asleep :) So don't worry it won't get extinguished :)