Do you believe all humans are conscious?
Generally, we exists it states of consciousness and unconsciousness throughout the day. For example, when you're driving, you are mostly driving unconsciously. Consciousness kicks in as need to make important decisions, such as, when the route has changed, when there's construction on the road, and you need to make a executive decision.
Children also are often not very conscious. Many people report a time in their life when they suddenly "became conscious" and prior to that they were not really conscious. Are there some people who never reach that stage and just remain, like children, unconscious?