burn both ends of the candle

burn both ends of the candle

To overwork or exhaust oneself by doing too much of something or too many different things, especially by staying up late and getting up early to do so. Oh, Denise is definitely burning both ends of the candle—she's been getting to the office early and staying very late to work on some big project. You've got to stop burning both ends of the candle like this, or you're going to drive yourself to an early grave!
See also: both, burn, candle, end, of