Regarding self-aware, conscious beings such as humans, we could say that awareness plays hide and seek with itself.
When awakening happens, it is seen that universal, all-pervading awareness always was. It didn’t just happen when “we” realised it.
So in a way it seems like nothing happened.
It’s as if enlightenment always was and what isn’t enlightened never will be.
And that’s very mysterious!
It’s like waking from a dream and saying “oh yeah, I was always this person”. When in the dream we actually had no idea we were dreaming.
The dream character never awakens. It ceases to be.
That’s what happens when we wake up.