Sleep time is not short, but the quality of sleep is not good. I still feel very tired after getting up, which is a typical sub-health. It is suggested to go to the hospital for a detailed physical examination first to make sure that there is no organic disease, so as to say for sure that it must be sub-health. Because if we want to prepare for the worst, many non-communicable chronic diseases, such as hypertension, diabetes and tumors, have symptoms similar to sub-health at first. Since your wife's symptoms are so obvious, it's better to be cautious.
If it is sub-health, then we should pay attention to the adjustment of diet, whether we have the habit of skipping breakfast, whether the three meals are irregular, whether the diet is balanced and so on. There is also exercise. Physical activity at work at ordinary times is not exercise. So exercise at least once a week, preferably aerobic exercise, for no less than 1 hour.