Alcohol causes a loss of judgment and alertness.

酒精会使人丧失判断力和警觉性。

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The drug improved mental alertness.

这种药物提高了大脑的灵敏度。

《柯林斯英汉双解大词典》

A short nap can promote alertness and improve performance, which are important when you are at work.

小睡一会儿可以提高机警性，提高工作表现，这在你工作时是很重要的。

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"I can say that,anecdotally, virtually all the teachers noticed immediately much more alertness in class, definitely more positive mood.

VOA: special.2010.10.07

Finally, avoid over-the-counter "alertness aids" like NoDoz and Vivarin, which are overloaded with caffeine.

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Toulon held firm though and were soon back in the ascendancy thanks to Wilkinson's alertness.

BBC: Cardiff Blues 28-21 Toulon

The "controlled rest" is legal and an accepted procedure in order to improve on-the-job performance and alertness.

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