This experience of being "in" a body is normally based on perceptual input from the senses of both the world external to the body and the processes within the body. These give us a sense of localization of the self in space. However, it is the body, and its sense organs, that occupy a specific locus, not the self. The self is not the body or the brain. If we think that the self is a product of brain function, even this does not make it reasonable to state that the self is in the brain -- is the meaning contained in these words in this page? It may not make any sense on an objective level to say that the self is anywhere. Rather, the self is where it feels itself to be. Its location is purely subjective and derived from input from the sensory organs.
http://www.lucidity.com/NL32.OBEandLD.html
Now, how do we disconnect from the input from our sensory organs without going to sleep? Or, you know, dying...