Below are the best resources we could find featuring robert monroe about sleep.
Bob discusses the experience of exploring higher consciousness through out-of-body experiences and audio-induced gamma brainwave states.
Robert Monroe was a pioneer of studies on consciousness. The interview is a rare document because he tells his evolution from out-of-body experiences to multidimensional travels.
Robert Monroe is known for his extensive research into altered states of consciousness, and is considered to be a pioneer of the western world in 'Out of Body Experiences', also known as 'Astral Projection'.