Well I have some experience in meditation. When I meditate I feel my body go numb first my legs than upper body than head. it's like you can't move them but you realy can. Then I just focus on my breathing and thats all for however long I meditate. Sometimes my mind combats over issues at school or with morals ect. It depends on your focus. Me being a christian can also focus on God and pray.
That whole thing with going numb is like your body falling asleep. i feel this web thing just travel up(I think Its just me though). you might not feel this but for me my mind kinda detaches itself and I fall into a breathing pattern. Then my mind is just all there is it's like a controled dream just thinking. It's kinda hard to describe.