As I understand it, they don' t really go nocturnal unless pressured to do so (people walking around in the woods trying to kill them). I' ve been driving in the countryside here in western NY at 10 or 11 at night w/ a bright full moon and seen entire herds out feeding in the bean fields. Unpressured like they are right now, I see them feeding right in the middle of the day. Yesterday I saw a big doe by the highway standing on the top of a huge pile of top soil at a construction site (sticking it' s tongue out).