Imagine a crossing, where you have 8 of them. Always clacking, slow or fast, and slightly drifting apart in tempo, to meet into synchronicity again after a few minutes. I'd go insane. The birds are going insane too! Since years I hear them at all times of the night, never sleeping. Interestingly near that crossing.

Edit: With at all times of the night I mean when I walk or ride along there, which can be anything from 22:00 to 05:00.

Anytime there is birdsong, now matter how late or early. Even when no cars are there, in the extra silence between 02:00 and 03:30.