The feeling you get when, two thirds of the way through a fantastic book/TV series, you have to keep reading/watching because it's excellent and you need to find out what happens, but you also don't want to keep reading/watching because you don't want the experience to be over.
I was watching series three of Breaking Bad, and wanted to keep watching but I was frozen by excitrepidation
Coined by Jeph Jacques of the webcomic Questionable Content.
It means a vegetative state of wakefulness; that hideous creeping inertia that compels you to watch stupid internet videos instead of sleep, forever.
Jeph, just close your laptop and go lie down," you say. "I can't," I reply. "I'm glemp.