よふ夜更yofuけkeよ夜yoふけfuke
1.
The time during the night when it has grown very late, often associated with deep night or the early morning hours.
2.
The period in the night when most people are asleep, typically characterized by quiet and stillness.
3.
A late hour in the night that signifies the transition from evening activities to the solitude of early morning.
Example:
我々は夜更けまで語り合った。