You can easily experience this yourself by doing grounding exercises in a lucid dream. “more real than real” is always the first thing that comes to mind.
We have only ever gotten close where, during a daydream, we managed to figure out that we could have been daydreaming, but past that, even our daydreams are completely non-lucid as well.
We suspect our autism is the culprit... but as for how to overcome it, we are at such a loss.
-Emily (our HN profile explains our signatures)