Some things I know about consciousness.

1 It's intermittent; we all sleep and have periods of non-consciousness.
2 It's slow (it takes time); as musicians we know from first hand learning needs consciousness to direct coconscious plastic systems in generating repeatable mechanical movements, but this is slow. Consciousness cannot operate by itself faster than about 1/2 to 1 second.
3 It is possible to be conscious without thought, but not without emotion, that is to say that it always "feels" like something to be conscious.

I think these are fairly obvious and testable statements.

PP