"Be shocked by the nature and wait for the light" literally means that people who are worried toss and turn at night, can't sleep, and can only look up at the dark sky, hoping that it will dawn soon.
However, because of the second half of the poem "Waiting for the Ming Dynasty", four people in the Qing Dynasty committed the taboo at that time and were suspected of regaining sight. And it was recognized as evidence of anti-Qing.