I was thinking about an experience that I've had a few times while lucid dreaming, where I remain conscious for almost the entire night of sleep. At one point, the dreams stop and I go to this place where it it almost like watching raw data being processed from the day that I had just experienced. Eventually the data is done being processed and dreamtime starts again.

Has anyone else experienced being lucid during deeper levels of sleep past REM? And if so, what was it like?