overfatigue

But how we are to take care of her and prevent her overfatiguing herself I know not. 

He perceived that the newly-made baroness was indisputably overfatigued, and that it was only natural her bridegroom should wish to take every care of her.

The seven or eight hours of day sleep seem to have taken that away without substituting rest; and what you have on your hands is an overfatigued body, refusing to be goaded further.

It was thought it was a faint brought on by overfatigue.

"And you have no fear that you will be overfatigued?"