The final three. I wasn't sure what direction to take these in. Everything in life needs a punch line, and having Z is for zzzz was the idea that made me go ahead with this from the start. For a while I was planning on making the ending more sequential though:
X is in Climax
Y is for Yawn
Z is for Zzzzz...
It's fairly neat but putting X is in is too much of a cop-out to bear.
Y was a real struggle. I got a lot of tips and was looking into Yoni, so to speak, for a while. But yoke works more or less.