I think our consciousness is an emergent property, like a rainbow. A rainbow is much more than just raindrops, but without the raindrops, there is no rainbow. Similiarly, our consciousness is, IMO, the emergent property of the computations by the neurons in our nervous system and when that decomposes, so does the person. They are involutary and hence not a part of conscious self-awareness. Breathing can be controlled, so it is in a grey area. Yes, because that shows self-awareness, agenticity, intentionality and deliberated and directed conscious use of cognition, perception, memory and thought.