Mine were ticked off this a.m. & refused to come out when I called. When I went around back & opened the coop-side door, roughly 10 sparrows were flitting about while the goons stood glaring at me. I gather they didn't sleep well.Mine weren't terribly loud. But they were little weirdos that wouldn't go to bed. They'd fly out into the yard and run around catching bugs in the outside lights. And then they'd take power naps on the ground and go again. I finally moved them into the barn where they wouldn't be so disturbed by the lights.