Sorry when I'm posting in the wrong topic, but i thought this is the right section.

[Mod note: Originally posted in the OBE forum. Post has been moved to the Meditation forum.]

Well i've been meditating lately,since a few days. Now i am on karate so every lessons we do meditate for only 1-5 minutes but, now I've been trying it at home too.
Once i start meditating I'm trying to think about nothing (yea duh..) but most of the time it takes quiet a time to archieve that. Once i think of nothing it takes only a few seconds and then there comes again a new thought (its just one but still a thought). When i keep doing this for about 15-30 minutes, I get aware of my whole body and at the same time i dont feel it. It's like my whole body is very heavy, (that is also the part it is hard for me to keep meditating cause it is feeling I'm beginning to fall asleep. Some people who have this experience to or is it just a part of meditation?
Oh and last time i stopped meditating I was shaking but i dont know why, really weird.