The Hearne (H.R.O.) Dream Machine, used in experiments by Keith Hearne to increase a subject's dream recall by detecting the onset of REM sleep, plus two books: Keith Herne, The Dream Machine: Lucid dreams and how to control them; and David Melbourne and Keith Hearne, The Dream Oracle: A unique guide to interpreting message-bearing dreams. Made in England, 1975-1978. The Hearne (H.R.O.) Dream Machine 1975-1978