Role of REM Sleep. It is interesting to note that Bob Monroe informed the Gateway class that finished 7 May 1983 that an ex-trainer of his operating in Charlottesville, Virginia found that he could guarantee out-of-body movements by bringing participants down into a rapid eye movement (REM) state of sleep and then use the Hemi-Sync tape technique.
https://rollingout.com/2022/05/27/slain-buffalo-officer-was-a-genius-worked-on-water-fueled-car-engine/