For someone (actor -um- & theme i-) to stay awake during the sleeping hours.
Theme, a reflexive `oneself,' is not expressed.
For someone (agent & inst) to stay awake in charge of someone or something (theme i-), as water one is guarding in a pond field, other ritualists while reciting prayers, a sick person one is watching, frogs one is catching, wild pigs one is hunting in a wild-pig fire-ring trap, gināat.