You cannot burn the candle at both ends 英文諺語
You cannot burn the candle at both ends 勿過分消耗體力；蠟燭不能兩頭燒
Candles are meant to stand up vertically. In this position they can burn at only one end. They can burn at both ends only if they are held horizontally, but they will burn at an increased rate and eventually extinguish. That’s the point of this idiom, continuing at this pace is fatiguing.
To work or do other things from early in the morning until late at night and so get very little rest; to exhaust oneself, especially by being up late and getting up early to work, therefore working extremely or excessively hard for good health or peace of mind.
If you are working or studying too hard, it would be said you are burning the candle at both ends. The inference is that you won’t be able to keep this up for too long. You will soon find yourself burnt out and over tired, so rest and play are some of the answers to working too hard.