Today's fantastic word is one that should be familiar to all night owls.
Study or composition lasting late into the night.
From Latin, lucubrare, which stems from lux, meaning light.
John didn't realise how long he had been studying for his up-coming exam. It hit him with a shock when he realised that his 'midnight snack' during his furious late night lucubrations was actually taking place at midday instead!