In the Defenders of the Realm rulebook, the Suffering Wounds section (p. 7) says
If a hero ends a turn in a location with enemy minions, the he suffers a wound for each minion at that location.
On first reading, I thought that meant that once a hero's actions were spent, they would suffer a wound for each minion present on their location. But, a player's turn is divided up into three segments (p. 5): Daytime(hero actions), Evening(draw cards), and Night(darkness spreads) and new minions are placed during Night.
Does a hero suffer wounds if minions were placed on their location during the Night as darkness spreads?