Death, always and everywhere, employs humans’ mind. It is an area of mysteriousness, which we will never get acquainted with. There is no exhaustive answer, but only that the body gives up function, wherewithal a live creature isn’t alive anymore, consequently it can’t fulfill its role in the world.
What does the human experience in extremis? We’ll never know it because he takes it to his grave (it’s too late for him to describe to someone his feelings before dying). Only medicine can describe syndromes, which overtake a human body in extremis, but they, in my opinion, are only just some worthless concessions, because I think that each person senses the death differently……