every night; night after night
Describes something that happens on consecutive nights, often in news reports about events, work, or disturbances.
I'm exhausted from working overtime night after night.
In that area, a fireworks festival was held every night.
day and night; every day and every night; around the clock
Compound of 連 (ren, 'in succession') and 夜 (ya, 'night'). The reading is on'yomi, and the word follows standard Sino-Japanese word formation.