fascinating! I never had thought before about live-long night and liebe lange Nacht as being related though it seems obvious now.
The German expression is old, so old that I now start doubting that 'liebe' in that Expression means 'dear'. It could be a corruption of 'Leben' but Wilfried is in a better position than I am to find that out.

'All through the night' is what is meant in modern English, but live-long night seems to be a wonderful translation.

Wolfgang