昼

不分昼夜

bù fēn zhòu yè

day and night

俾夜作昼

bǐ yè zuò zhòu

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

俾昼作夜

bǐ zhòu zuò yè

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

卜昼卜夜

bǔ zhòu bǔ yè

day and night (to toil, to abandon oneself to pleasure etc)

夜行昼伏

yè xíng zhòu fú

to travel at night and lie low by day (idiom)

宰予昼寝

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

昼伏夜出

zhòu fú yè chū

nocturnal

昼夜

zhòu yè

day and night

昼夜平分点

zhòu yè píng fēn diǎn

the equinox

昼夜节律

zhòu yè jié lǜ

circadian rhythm

昼短夜长

zhòu duǎn yè cháng

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

昼行性

zhòu xíng xìng

diurnality; diurnal