zhòuyè

day and night / period of 24 hours / continuously, without stop

zhòu

daytime

zhòufúyèchū

nocturnal / to hide by day and come out at night

ZǎiYǔzhòuqǐn

Zai Yu sleeps by day (idiom); refers to story in Analects of Confucius remonstrating bitterly with his student for sleeping during lectures

zhòuyèpíngfēndiǎn

the equinox

zhòuyèjiélǚ

circadian rhythm

zhòuduǎnyècháng

the winter days are short and the nights long (idiom)

bùfēnzhòuyè

day and night / round-the-clock

bǐyèzuòzhòu

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

bǐzhòuzuòyè

to make day as night (idiom, from Book of Songs); fig. to prolong one's pleasure regardless of the hour