@Lara: There was a reason. My idea included some wordplay. My first step was looking up all sorts of expression containing either 'mid', 'night' or a rhyme on 'night'. I ended up with more than five dozen expression - and, doing the maths, I realized that I couldn't use them all. So I chose the ones fitting best.
Then I wrote what I wanted to write. And deleted more than half of it because there were still too many words, thereby erasing most of the puns.
