I chalked my sleeplessness up to nerves.

我归于神经张。

Some are nervous in the dark.

有的人在黑暗处就神经张。

Why is it doctor that I am always so nervy, tense and ready to jump on anybody.

大夫，为什么我总是感到神经质、张、爱发脾气。

We were tense with expectancy.

我们因期待而神经张起来。

Conclusion: The changes of circadian variation of blood pressure are associated with the role of sympathetic nerve and intracardial renin angiotensin system.

结论血压昼夜变化受交感神经与肾素血管张素系统等双重作用有关。