I don't know why my Buff goose will only sit on her nest at night, in the mourning she leaves the nest all day. When she was a year old last year, she seemed to be broody and I saw her on the nest all the time. The only problem last year were the eggs were warm when she left the nest and I knew the eggs were dead. She is two years old now, so I thought she would be more experienced and get it right.