zhòu yè
day and night
period of 24 hours
continuously, without stop
bù fēn zhòu yè
day and night
round-the-clock
zhòu fú yè chū
nocturnal
to hide by day and come out at night
zhòu duǎn yè cháng
the winter days are short and the nights long (idiom)
Zǎi Yǔ zhòu qǐn
Zai Yu sleeps by day (idiom); refers to story in Analects of Confucius remonstrating bitterly with his student for sleeping during lectures
bǐ zhòu zuò yè
to make day as night (idiom, from Book of Songs); fig. to prolong one's pleasure regardless of the hour
yè xíng zhòu fú
to travel at night and lie low by day (idiom)
bǔ zhòu bǔ yè
day and night (to toil, to abandon oneself to pleasure etc)
bǐ yè zuò zhòu
lit. to make night as day (idiom); fig. to burn the midnight oil
work especially hard
yǎn rú bái zhòu
as bright as daylight (idiom)