Peak effort better be continued without reflection, without attending to any object. Consciousness remains empty. Often nonconceptual experience, in WPP, is triggered by an abrupt sense perception. Something catches our visual attention or a sound shatters the stillness. Perhaps an emotion vaults to the surface.
Realization comes suddenly and unexpectedly.
Sometimes it is independent of sitting practice. Mouth slightly opened. Breath is forced through narrow gap between lips. This controls wandering thoughts. The abdomen collapses slowly, yet we don't let the lower portion of the abdomen fall completely.