The concept Gemoro Shabbos 94a that חי נושא את עצמו - a living being “carries itself” - means that someone who carries a living being out on Shabbos unwittingly is not liable to bring a sin offering.
I understand that one of the reasons for the concept of חי נושא את עצמו is that the living being adjusts his posture and hence how his weight bears on the carrier in response to the movements of the carrier. If he is unconscious, he may not be able to do that.
(BTW - A dead person is not heavier than the same person before he expired.)
When the “living being” is a human, is it right to think that חי נושא את עצמו applies only when the human being is conscious?