My friend fell unconscious from dehydration. We immediately fed him 4 bottles of water and lots of food and waited 10-15 minutes but he did not regain consciousness, despite also trying CPR.
We tried tying him up and untying him to see what happened. While tied up he was able to wiggle while still unconscious, and after being untied he was able to stand up and walk around, still unconscious. After feeding him more and waiting he tried disconnecting from the game as a last resort but his character died.