Midnight Miner 

One who enters sealed or abandoned mine shafts to explore or collect minerals and artifacts, generally under the cover of darkness.

Midnight miners had gained entry into the old Pewabic mine by using a 20 ton bottle jack to pry up the concrete cap.

Midnight Miner by Toivo and Eino January 10, 2009

midnight miner 

one who picks their nose in their sleep

he was great in bed but when we woke up I discovered he was a midnight miner

midnight miner by rebelyid March 2, 2005