ha ha this thread is classic. I just think "hmmmmm I reckon 3 hrs of that was night" and log that. Then I halve it and call that instrument time.
Some people on these boards will be very upset with me for logging 1.5hrs instrument flight time when it may have been beautiful VMC clear night, but I don't want to spend my time figuring out if I'm IMC or VMC and it gets to a point where it doesn't really matter anyway. I mean who cares if you have 5000hrs of IMC or 6000hrs?
Edited to say: I don't have that much....it was just an example.