Art by smbc-comics
Consciousness is often said to disappear in deep, dreamless sleep. We argue that this assumption is oversimplified. Unless dreamless sleep is defined as unconscious from the outset there are good empirical and theoretical reasons for saying that a range of different types of sleep experience, some of which are distinct from dreaming, can occur in all stages of sleep.
Pubmed Articles
Does Consciousness Disappear in Dreamless Sleep?
Sciencealert Article We Were Wrong About Consciousness Disappearing in Dreamless Sleep, Say Scientists
What surprises me, is you wouldn't accept the relative/changing definition as a valid definition itself.
Guess that could be an interesting conversation, potentially shedding some light on different worldviews... but I don't really know where to begin. Curious.
I refer you back to my original comment involving the impact of not having a good definition of death and what that causes.
Your definition does not clarify any of the resulting problems arising from trying to define all the other concepts.
It's a good definition for some scenarios, but not at all or in any way, this one.