Any attempt at a physicalist account of consciousness would run up against the problem of time, in that consciousness is never momentary but occupies a temporal interval in a strongly ontological sense. It's not a matter of a point of presence, a guarded expectancy and a fading retention, but of the animation of a concrete and variable interval of time. In fact it seems that if consciousness must extend to an interval and granted it being impossible to put boundaries to it, then it must occupy the entire span of life, from birth to death. Say that is its native state and that it only appears to be a mystery because a mere temporal cross-section is mistaken for the whole thing. Even what you think of as a thought is only a cross-section of the true thought.