The day when the Komala wake up, at least according to legend, is the first sign of the apocalypse. Komala are pokemon who sleep their whole lives, and the very notion of one waking up seems to many Alolans, ancient and modern, to be a grand violation of the natural order of things – even though related pokemon, such as Kangaskhan and Timburr, often keep their eyes open.
Surprisingly, scientists have begun to question whether Komala is asleep at all. Although their dreams, if that's what they are, can nourish Musharna and Hypno as well as any sleeping pokemon's, Komala are capable of not only eating leaves, but fleeing predators, mating, laying eggs, and participating in pokemon battles - all, apparently, without waking up. Experiments involving a variety of awakening methods, from the pokemon center machine to a Pokeflute shipped in from Kanto, met with massive public protests and arguably invented the archetype of mad scientists willing to end the world by accident (notwithstanding that it is all the Komala, not just a single individual, which the old tales claim awaken in the end of days) – but no antisedative had any effect on these pokemon.
Some have suggested a Komala's dreams incorporate information from their outside environment, but in skewed ways; a hungry Braviary may be imagined as a Zapdos or some unearthly monster, but the shadows from above enter their dreams all the same, and likewise for their other biological drives. To others, the Komala were never asleep to begin with, their "eyelids" are simply fur-covered eyes (or they rely, like Zubats, on smell), and they sleep no more than other pokemon, but no one can ever tell whether or not a particular Komala is sleeping.
At least until, if the legends are true, the end of the world.