夜

fifth division of the night (approx. 3am to 5am)

dinner

third division of the night (approx. 11pm to 1am)

second division of the night (approx. 9pm to 11pm)

first division of the night (approx. 7pm to 9pm)

many nights; a thousand nights

fourth division of the night (approx. 1am to 3am)

midnight; dead of night

night attack

sleep; rest