Sorry to interrupt but is the meditation for OOBEs?

If it is then Its the rhythm of breathing that does it. Sets of 4 just to get into the swing of things then you can change it to another pattern (I can't remember which one it is maybe 5/7)

It doesn't take long but you will be aware of cool wind blowing around your head and it will be very very noisy, then you will be out of your body. It's kind of freaky at first.

There are some great books on it.