“夜里”就是晚上的时间，特别是很晚、大家都睡觉的时候。

"夜里" means the time at night, especially very late when everyone is asleep.

我们常说“夜里下雨了”或者“他夜里睡不着”。

We often say "夜里下雨了" (It rained at night) or "他夜里睡不着" (He can't sleep at night).