Once or twice a week I hear a crash in the bird room late at night. It's one of my red-fronted macaws. When they aren't nesting, they sleep hanging on the side of the cage near the top. It seems that one of them falls off at some point during the night. I check the camera that's pointed at their cage and I see one of them climbing back up. There is a little preening and fussing, and then they go back to sleep. Is this something to be concerned about?