Awakening can happen in a single moment. Zen masters have been known to use loud noises and shouting to awaken their disciples. In that moment, there is no thinking, no judgements, duality, good, bad. All becomes quiet; still.
The same can happen when we are startled, in a moment that calls for quick response by the body. When we are startled, there are no thoughts, just being startled. Even for the tiniest instant, everything had been put down. The interconnected systems of the body are simply reacting to a stimulus — going through a process. There is no room for extraneous thoughts and trivial worries. To reach this point in daily life is the ultimate stillness; the happiness of no happiness. No extremes. No place for thoughts to abide. Thoughts pass like clouds over still water, reflecting in the pond when they are there, and having no reflection when they are not.