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.

我们对于睡眠这项课题的研究已经持续了很长的一段时间了，我相信你对于睡眠不足这个词语肯定印象深刻吧。

2.midnight oil 点灯熬夜

"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.

“我们这群人没有一个能睡饱觉的，”睡眼朦胧的布什总统在熬夜决定是否轰炸伊拉克后说道。

3.on a regular basis定期的；经常的

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

为了保持良好的精神状态，需要定期进行一些简单的头脑运动。