* Adds a proper unconscious disease
 * will cause the player to fall unconscious when the player has a low
   blood oxygen level
 * will kill the player if their blood oxygen level gets very low.
 * if the player is unconscious when swimming. they will float to the
   surface
 * when unconscious the player is "asleep" but with specific conditions
   attached, namely they will not wake up from
   heat/cold/tiredness/brightness. the unconscious disease will wake the
   player up when it is finished.