Natural OEB? Might just be the hippiest thing I've ever heard.

If you refer to lucid dreaming I simply lay on my back with arms below my head under my pillow, works everytime.

To actually experience an OEB without drugs is something I do not see as a possiblity, of what I've read about the actual thing it doesn't sound any different from normal sleep paralysis which IMO is easiest achieved when you wake up in the morning and right after take a warm bath.

In comparison to what you're talking about a OEB on DMT is completely different, you are physically there and you may actually feel physically exhausted upon coming out of the experience. I often come out shaking violently due to some serious adrenaline levels achieved while in "hyperspace" and these doesn't kick in untill I "come out" (come down just doesn't cut it with DMT,IMO)

The often dark, puzzling and story-telling scenarios alot of people have during a vivid dream is to me quite characteristic with most DMT experiences, as if you're following a predestined path, maybe it's fate guiding you