The hangover is an astonishingly complex physiological phenomenon, with dozens of symptoms and relatively little human trial data - rats and a few undergraduates are the preferred model for much of the relevant research.

BBC: US chemistry meeting tackles science of booze

Luckily, the rich repertoire of behavioral symptoms shown in cinema gives the astute neuroscientist or neurologist clues as to the anatomical and physiological underpinnings of zombie behavior.

FORBES: Explaining the Neuroscience of the Zombie Epidemic