Because caffeine, people! We are out of caffeine and the store shelves are empty. It seems our zombies don’t need sleep, but dammit, we are human! We need at least six uninterrupted hours of restful sleep to perform optimally, and frankly, we are not getting it. Sans caffeine, we live in heightened fear with the knowledge that any day now, zombie fingertips will grip our shoulders as our own exhausted bodies lumber fitfully, tics and all, toward an abandoned Starbucks. Must. Have. Caffeine.