midnight

(Hinduism) Yama, the Hindu god of death / (Buddhism) Short for 夜摩天 (Yamaten): Yama, the Buddhist ruler of 奈落 (Naraku, “Naraka, hell”)

late at night

a night owl (idiomatic)

(euphemistic) job in the nightlife / sex industry

(Internet slang, humorous, pun) Christmas Eve, as a night of sexual activity between young couples

(collective, literally) a thousand nights / (archaic, figuratively, collective) lots of nights; an innumerable number of nights

a female given name

Short for 十六夜の月 (izayoi no tsuki): the moon just past the full moon, the start of the waning moon

the sixteenth night of the month under the lunar calendar, just after the full moon