Birds singing at 1am??

Maybe you'd be best off recording what you can hear and posting it up here?

Also idk if you know about the app Merlin, it's a bit like Shazam for bird song/calls, you could try using that to identify the singing

Funny I was just thinking same last night while I was on my night shift.

I have been out often during the night recently, between 1am and 4am, and there is always birds chirping. And its always dark.

Began to wonder was this always a thing, birds being awake during the night?

the Robin will sing night or day if he is well feed maybe a food bin went upside down in the storm and the little lad filled himself