well, I once visited a guru in india who said that to bring anyone out of a coma (presumably anyone non-braindead), you have to put some sugar in their mouth and whisper a special mantra in their ear that I forgot.

anyhow if I'll ever be in a coma I'll test out the whole Lucidity helps you wake up thing and see if it works- worst case scenario I'll have an amazingly long and cool LD