1.sleep debt 睡眠不足

We've been on the subject of sleep for quite some time now and I am sure you have come across the term sleep debt.

我們對于睡眠這項課題的研究已經持續了很長的一段時間了，我相信你對于睡眠不足這個詞語肯定印象深刻吧。

2.midnight oil 點燈熬夜

"None of us have had a great deal of sleep, " a bleary eyed President Bush said after burning the midnight oil deciding whether of not to bomb Iraq.

“我們這群人沒有一個能睡飽覺的，”睡眼朦朧的布什總統在熬夜決定是否轟炸伊拉克后說道。

3.on a regular basis定期的；經常的

To stay in good mental shape, perform these simple brain exercises on a regular basis.

為了保持良好的精神狀態，需要定期進行一些簡單的頭腦運動。