Critical Awareness

In Nursing School, and then in practice, we hear a lot about Critical Thinking. It is a tool that develops over time, as the practitioner gains experience, and acquires a deeper knowledge base.
Furthermore, the more experienced Nurse, will eventually attain Critical Awareness, whereby, very subtle cues exhibited by a patient, or even a situation, alerts that Nurse, about impending trouble.

I used to work at night
I have a great respect for the dark,
Getting homeostasis balanced
Is not a walk in the park,
We night-time nurses needed to be watchful
Apprehending subtle cues,
Explosions take time to develop
Better keep an eye out for the fuse.