I don't think our minds 'get ready to lucid dream' ... this is an accidental phenomena (or accidentally on purpose in our cases). It is a bit like a high wire act. Gravity wants the acrobat to fall and it is only his will (and great balance) that keeps him from taking a plunge. LD's are the perfect balance between two states of consciousness that, in a normal brain, should not coexist. Learning to walk that esoteric high wire is what LD'ers are all about... if that makes any sense at all.