The first aspect is that after a night of dormancy and adjustment, the brain nervous system has not been started, and the functions of various parts of the body have not been restored, so the body naturally cannot operate. That's why you feel weak and can't hold your fist.
The second aspect is that when you sleep, every organ cell in your body is also resting. When you wake up in the morning, but your body organs and cells don't wake up, the nerve tissue doesn't respond. Of course, it also has something to do with weekend mornings. Morning is usually a lazy time. At this time, the human body will naturally relax and the brain consciousness is not yet active. At this time, your body is in a soft state and your nerves are relatively weak, which leads to weakness in your hands.
The third aspect is hypoglycemia. You haven't eaten all night, your blood cells don't have enough nutrition, and you can't bend your fingers for a short time. If my limbs are weak for a long time, I think it is necessary to go to the hospital to check all aspects of my body. Another possibility is that you usually have symptoms of hypoglycemia and anemia, so you feel weak.
In view of this phenomenon, I personally think that it is very harmful to your health not to sit up immediately after getting up in the morning. When we wake up, we can lie in bed for a few more minutes, and then get up when the body can function and all parts are awake. Now because of work, I can sleep for one more minute, and get up and get ready for work when I am late. In fact, what they don't know is not good for their health.