Originally Posted by
Sageous
If you notice that everything is just gone, including not just schematic imagery, but control, stable input, and even your DC dream-body. That absence, that void, coupled with the literally ubiquitous presence of your self-awareness, ought to be enough to confirm that you are in Delta.
Because NREM also blankness in the the dream-presentation program. Also, if you are able to stay lucid and asleep straight through a REM period, you will find yourself in a gray, post-REM place where everything seems to be gone (except, for me at least, a gray mist or blackness subtly offset by gentler shadows). So: NREM is probably a bit easier to experience than you might think, since we all might be there more often than we think, but Delta -- especially the longer periods of very deep sleep early in the cycle -- is much more difficult to experience, simply because it doesn't fall into the regular lucidity program, and we are hard-wired to ignore Delta on every level, including NLD's.