Are we to assume that your Anaesthetic Engineer doesn't work a day-time shift as well though, Bill?
What's wrong with "flexi-time"? That is, adjusting working hours (or patterns) to suit the needs of the job?
Lots of folk work shifts (and not only in hospitals). Some even have to grapple with "three days of days", a day off, then "three days of nights" (or whatever);
that sort of thing is the real killer.

And "unsocial hours"? Just another example of modern day "new speak", in my opinion. Work is work. Those who are in any form of secure employment should count their blessings.