Saw this on TV (colour), probably in the 80s or early 90s, but not certain. It follows a guy in the US (maybe New York?) as he leaves work to go home, and gets embroiled in a series of adventures/mishaps throughout the night – clubs/parties, robbery, mistaken identity etc. It ends at dawn with him stumbling down the street (having never made it home), realising he was outside his office, and just going back in to work.
No-one I have ever mentioned it to has any memory of this film…
Try Martin Scorsese’s After Hours.
That could well be it – cheers!
I’m going to mark it solved, but feel free to reopen it if you find it’s not what you were remembering.