midnight oil

Earps burned the midnight oil more than most – at one time she had six part-time jobs, including working at a toy shop and a cinema.

“My staff is burning the midnight oil for a month now,” McGuire said.

That’s 02:00 GMT for those in the UK now burning the midnight oil.

The midnight oil was ignited, but it didn't need to burn for long.

They have been burning the midnight oil in the last week to try to figure out what they have not understood, so it will be interesting to see how they get on in Melbourne this weekend.