That is 深夜

I had a late night. 1. 我昨天熬通宵/熬夜了。 2. 我昨天很晚(才)睡。 3. 我昨天没什么睡/睡得很少。 In English, when we say I had a late night, it means the night before. In Chinese, the 昨天 is usually included in the sentence.

Could you give a sentence? Do you mean it's late at night? or I've had a late night (I've stayed up late)?