As far as I’m aware, Castaneda was the first person in the popular culture to discuss lucid dreaming, in his 1972 book Journey to Ixtlan. And his associate/groupie Taisha Abelar wrote an article about “Tibetan Dreaming” in an obscure journal in 1970.
Castaneda was obviously doing lucid dreaming well back into the Sixties.
He was a notorious liar and a cult leader, but did he have anything to say about lucid dreaming that was worth listening to?
Yes, he did, in his 1993 book The Art of Dreaming. I highly recommend it, although you need to skip all the stuff about the assemblage point, Don Juan and the Tenant.