sorry my OBE side came in to play there lol oh and the reason you could not get out of your body is proboblly because of chakras and other energy body aspects unfortunatlly OBE is sooo much more complex than lucid dreaming however i am not stating that lucid dreaming is inferior ovcource.
Anyway that tequnique is ment for trance induction it can induce a concious exit OBE however to achieve an LD you need to be in the same state as the 3rd state of OBE wich is hypnagogic imagery. But yeah as i mention it is simplly a trance induction tequnique it actully come from robert bruce as stated above. For a referance as also mentiond above it come from the book “astral dynamics a new approach to outer body experience” if you are intrested i highlly recomed you get a copy. as also stated above lol i think i might be repeating my see a wee bit.