So help me, I am not trying to make fun of you but of myself. I was trying to remember where I used the term "PPD" before. Suddenly it came. It is from a previous life and there it means "Post Prandial Depression", which is what makes one want to fall asleep after a meal. It is an important part of Human Factors Research.
I'll use pPD then in the future to denote the para or lower case "P". I'm glad you were wide awake.