A couple of weeks back I heard a robin sing somewhere past midnight.
Ok, that makes it sound like a bird was singing a song by that name.... I mean, birds don't usually make noise at night but this one was and it was after midnight!
I heard this bird again last night. I wasn't having a good sleep so it was probably two or so in the morning and there was that robin singing.
I heard it off and on all morning and when I was home again I still heard it (I mean, I'm assuming it's the same bird!)
I googled and there's a suggestion that when birds sing at night it's because it's "too noisy" during the day for them... ugh.
So, yeah, I have a robin near me that is somehow disoriented and thinks the middle of the night is the time of day to flirt... or whatever.