The weakness of the limbs in the morning is usually due to three reasons. 1, due to excessive activity during the day, the muscles of the limbs are in a state of tension and fatigue for too long, consuming more electrolytes, energy and nutrients, and there is a cold during the night sleep, which will lead to the accumulation of local inflammation and metabolites such as lactic acid, and the muscle tissue is tense during the night. 2. It is possible that the cervical spine is abnormal, such as spinal cord cervical spondylosis, because the pillow is inappropriate, too high or too low during night sleep, especially the cervical spine with cold, it will cause the spinal canal to squeeze the spinal cord, resulting in a decrease in the neurological function of the spinal cord, and it is possible to feel weakness in the limbs when you wake up in the morning. 3, brain diseases, such as cerebral thrombosis, brain tumor, cerebral infarction, may lead to brain lesions on the brain nerve stimulation extrusion, resulting in neurological decline, there may also be symptoms of weakness of the limbs.