The very secret of the OBE experience. Put the body to sleep and keep the mind awake. What naturally happens in sleep? All bodily sensation is cut off. You dream of running but your feet do not move in your sleep. You dream of screaming but you do not scream in your sleep. You hear things that are only created within the walls of your own brain.
Part of facilitating the OBE experience is to encourage this separation. It is done by eliminating as much communication from the body to the brain as possible as well as discontinuing all self talk. Stilling the attention of the brain instead of allowing it to wander.
In the end, there is just the brain. And that is when the fun starts.