According to Osho, in Sahaj Samadhi the breath becomes very rhythmic, harmonious, almost musical—a soundless sound—and, when one is inactive, exceedingly blissful. It reduces to the bare minimum needed to sustain the body, as being eclipses life-functions. Such a person can subsist on little oxygen; breathing continues only to relate with the world.
In this state, your breathing becomes soft, even, tiny, and joy-filled—almost stopping, yet just enough to keep the body alive.