Drawn in 2013. From the original description:

"I've been awake since 3am. It's now a bit after 5pm and I am definitely crashing. One thing I've noticed the most about being sleep deprived is that my brain tends to play tricks on my eyes, and shadows will appear to move in the corner of my eye. I'm trying to stay awake so I can go to bed at a semi-normal time tonight, so of course I'll draw out the concept, but with a bit of artistic license thrown in."