Questions & Answers about bame gotong ttaemune mos jasseo.
밤에 means at night or during the night.
Here, -에 marks a time expression, so it tells you when something happened.
- 밤 = night
- 밤에 = at night
In this sentence, 밤에 sets the time for 못 잤어 (couldn’t sleep).
By itself, 밤에 usually just means at night or during the night. Whether it means last night, that night, or nights in general depends on context.
For example:
- In a conversation about yesterday, 밤에 못 잤어 will often be understood as I couldn’t sleep last night.
- Without context, it can simply mean I couldn’t sleep at night.
So the Korean phrase itself does not always force one exact English choice.