From The Enigma 
NPL Magazine
December, 2015
WITZ

The answers to the key words in this flat are anagrams.

They work through the night,
Pulling really long shifts;
A caring profession
Where one pays one's dues.
All _ _ _ _ _ _ _ _ _ in a hospital
Suffer from _ _ _ _ _ _ _ _ _ ;
It's gone on for years,
So it's really not news.

HINT:
First blank: Doctors training for a specialty

Answer:

RESIDENTS
TIREDNESS