If the universe was fine tuned for our life...

[TubbyTubby]

In order to define "sub reality" I have to use words.

Let me help, there's a simple reason you are struggling to describe it - it (sub reality) only exists in your head.

A sub reality is a space continuum that is governed by rules. The space continuum of a subreality is not the space continuum of its parent reality.

Case in point, this sort of mumbling is the result of trying to describe something that doesn't exist (except in your mind). Just accept it, forget about sub-realities and move on. You'll make some room in your brain for some other delusions to move into.