Thanks to some unfortunate and inevitable scheduling coincidences, I was awake (and active) from 2 PM on Tuesday until 6 AM on Thursday. (Aside from almost passing out on the toilet.) By late Wednesday evening, two cups of coffee, 4 B-12 pills, a liter of Dr. Pepper and carb-heavy foods were only keeping me stable. What's weird though, is that despite it all and even after I stopped the caffeine intake (around midnight), I didn't start to feel tired until right when I got home at the end of the night. Then it hit me all at once. It was like my body was faking energy out of necessity.