Sat in a barn in Novy Sobor, got shot in the Head by a Makarov, bandanas as headware, no helmets, anything like that. My friend killed him. When I went unconscious I was lightgreen hydrated and energized.
The way waking up before was regaining as much as blood as the bloodlevel outnumbers the shocklevel on a player, or giving epinephrine.
I was unconscious for at least 20 minutes before I logged out and obviously died which was I expecting.
The only thing we didn't try was epinephrine. Unless something changed about the mechanic of regaining consciousness, there is a bug that makes a character unable to wake up from the state of unconsciousness.