Meditation is not reflection or discursive thinking necessarily. It's pure concentration, training the mind to dwell on the interior focus without wandering, until it becomes wholly absorbed in the object of it's contemplation - consciousness. An intense inner wakefullness.

Kind of akin to when your studying for something, or become fully absorbed in a book and at some point someone calls out to you or says your name with you not even hearing it. Meditation is very similar to that. It's focusing deeply on consciousness itself...that's all, eventually all senses closing down, like unbuttoning a jacket until it barely weighs on you at all.

As you deepen, the senses close shop, one by one. The ears hear but YOU do not hear, your extremities feel but YOU do not feel, the nose smells but YOU do not smell; becoming fully unhinged of the various senses.