re: Any OTer decided they were fed up with shift work and changed careers?

View your salary in terms of compensation for what you are unable to do because of your work. For you, that's likely something along the lines of a consistent social life and adequate sleep. If you have a family, you have more issues more than likely.

Determine how much compensation is worth what you're giving up. If it's not worth the %increase in pay then look around. If it's worth it, stay.