They will sing at night if they're "frustrated" and haven't found a mate. I've seen song sparrows do this as well, but it was near a well lit area, so that may

They will sing at night if they're "frustrated" and haven't found a mate. I've seen song sparrows do this as well, but it was near a well lit area, so that may had some influence. https://www.allaboutbirds.org/news/what-can-i-do-about-a-bird-that-sings-all-night-long-outside-my-window/ https://www.allaboutbirds.org/news/what-can-i-do-about-a-bir...