My chickens aren't all that quiet at night. Maybe they talk in their sleep or something. I can walk by the hen house during the night and say, "How's it going, Hilda?" Then I will hear a soft, "Brrrrrrrrrrruhhh. Brrrrrrruhhg." If I leave the window open in the living room at night and just sit quietly, I will hear all kinds of sounds from the hen house. It doesn't seem like they are having olympic games in there or anything, but there might be some pillow talk going on, or even games of "5 in the bed (and the little one said roll over, roll over)" or "5 little monkeys jumping on the bed." lol
I suspect, though, if a chicken were alone in the woods at night, she would be hiding out and quiet as possible.