Catching some Z's - to get some sleep. In comic strips, Zs are used to show that someone is sleeping or snoring (http://idioms.thefreedictionary.com).
It has been great fun participating in the Challenge for 2015, especially reading other posts. We are all creative people and seeing how everyone interpreted the alphabet was amazing.
So, after an exciting month of the A to Z Challenge I think it's time to relax with a cup of tea and catch some Z's.