- What role do unrealistic deadlines and "always-on" expectations play in workplace fatigue?  

Theoretically we should be offline after working. But now we have WeChat. So our bosses can contact with us everytime. That lets unrealistic deadlines and "always-on" emerge. After working night and day we will be extremely exhausted.

Yes. Online chat softwares contributes to that. I especially hates the software that can show on if one has read the text.