焚膏继晷

lit. to make night as day (idiom); fig. to burn the midnight oil; work especially hard

to rise early and sleep late (idiom); to work hard; to study diligently

night and day (idiom); continuous strenuous effort

to work from morning to night (idiom)

to raise a lantern and fight at night (idiom); fig. to work into the night; to burn the midnight oil

to stay up through the night (idiom)