熬干灯

Traditional (Taiwan): 熬幹燈

áogāndēng ㄠˊ ㄍㄢ ㄉㄥ

    • to stay up late with nothing in particular to do

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
to burn the lamp dry
Meaning
To stay up until the middle of the night with nothing particular to do. Informal.

Sources