There are many aspects of the patient’s sudden dizziness, nausea, lack of energy, and desire to sleep, such as cerebrovascular disease, hypotension, hypoglycemia, and cervical spondylosis are possible causes. Specific analysis should be combined with the patient’s underlying disease: 1, if the elderly previously existed in the cerebral arteriosclerosis, based on hypertension, diabetes, hyperlipidemia, the sudden appearance of the above symptoms, to consider may be formed because of cerebral tissue ischemia, hypoxia, need to consult the hospital, improve the head CT or transcranial Doppler examination to clarify; 2, the patient if the poor feeding or vomiting, diarrhea, etc. If the patient has poor diet or vomiting, diarrhea, etc., resulting in insufficient blood volume and hypoglycemia, it may cause the patient to have dizziness, nausea, weakness and sleepiness; 3. If the patient has dizziness, nausea, weakness and sleepiness in the case of improper posture, it should also be considered as vertebral artery cervical spondylosis.