To burn the midnight oil implies working overtime or working over normal capacity.
"Looks like we're going to have to pull an all-nighter today. We're going to be burning the midnight oil."
by Rick 'Wild Thing' Vaughn April 07, 2006
Make coffee to stay awake
Boil some water, I'll be burning the midnight oil and I take my coffee black.
by A gumpy Gen-X January 31, 2016