在第三和第四阶段（通常称为“深度睡眠”），这时唤醒一个人是很难的。

During stages three and four (often called "deep sleep") , it is very hard to wake up a person.

youdao

这个阶段(从开始，到初次约会，到初吻)会持续一周或者一月，此时生理唤醒水平还是比较高的。

This early stage (the beginning, the first meeting, the first kiss) is followed quickly by the first weeks and months of the relationship, and the physical arousal level is high.

youdao

然而，很多这样处于潜伏期的人们在其人生的某个阶段，这些致病微生物将被“唤醒”从而引起活动性疾病。

However, in many of these people the microbe will "awaken" from this latent state at some point in their life to cause active disease.

youdao