Sometimes fatigue is a good thing.
Body builders push their muscles to the point of fatigue so they'll develop bigger and stronger.
Playing with children or grandchildren yields a feeling of pleasant fatigue at day's end. And it's very satisfying to rest your fatigued body after a day of planting your garden, painting your house, moving furniture into your new home or running a marathon. But if you find yourself unable to get out of bed in the morning when your major exertion was walking the dog or washing your car the day before, fatigue isn't a good feeling. It's a problem. But you definitely aren't suffering alone.