Love this 1959 documentary of life at the BBC looking at the overnight operations, including a hilarious sequence apparently filmed in the wee hours in the Bush newsroom.
'Anything new for the 0300 bulletin?'
It's still like that, well, sort of. My favourite sequence is the security guard ringing Jack De Mannio to point out that it's half past five in the morning. They ought to bring that sort of thing back.