Motivation is not constant. Willpower is a limited resource. Perpetuum Mobile kind of productivity doesn’t exist. And you deserve to spend some quality family or “me time” after 8 hours of work even especially if you work from home.
The fact that you work from home doesn’t mean that you should be at work 24/7 always prepared for the next project, professional task, or assignment. In fact, the opposite is true: setting crystal clear work-life boundaries will help you to make work from home benefit your lifestyle. And the easiest and most effective way to draw a clear line between professional and personal life while working from home is to organize a perfect workspace.