The night before I turned 19, I was laying in bed attempting the "mind awake, body asleep" method, and I had an interesting experience.
It felt as if I was magnetized to the side of a cliff (that I could see over), and I could feel pressure pulling my body downwards (like towards the wall adjacent to my feet)
I came too near instantly though, because my brother woke up and went to the bathroom >.>;;
But this is my closest experience and I thought I would share it :D
Thanks for sharing :-D I read somewhere a couple years back, than the way you leave your physical body determains what plane you will be in to start. For example, in your case, since you where being pulled down you'd be in the lower, vice versa.
~astraladdict