burning the midnight oil

working very long hours, often into the night What doctors do know is that burning the midnight oil is bad for your health.

Etymology: from the use of oil to provide light before the invention of electricity

Name	Pronounced	Usage
Siegfried	ZEEK-freet (German)	German, Germanic Mythology
Hannes	HAH-nes (German), HAHN-nes (Swedish, Finnish), HAHN-nəs (Dutch)	German, Swedish, Dutch, Finnish
Evie	EE-vee, EV-ee	English
Benedito	-	Portuguese
PÉNÉLope	pe-ne-LOP	French
Domenic	DAHM-ə-nik	English