Sweating, fatigue and sleepiness may be caused by heat stroke, neurasthenia and autonomic disorders. 1. Heatstroke: excessive exposure to the sun in summer or not paying attention to rest may lead to heatstroke, with symptoms such as generalized sweating, fatigue and sleepiness. However, when the patient’s condition is serious, there may also be dizziness, vomiting and other symptoms. 2. Neurasthenia: neurasthenia is a kind of neurosis with the weakening of brain and body functions, when the patient suffers from neurasthenia, it may lead to weakness, sweating, sleepiness, emotional instability and other symptoms. 3. autonomic nervous disorder: if the patient has autonomic nervous disorder, may be caused by autonomic dysfunction of multi-system dysfunction, the majority of patients have no obvious symptoms, a few patients may appear excessive sweating, fatigue, sleepiness, numbness of the limbs and other symptoms. When patients experience excessive sweating, fatigue and drowsiness, they should go to the hospital immediately to clarify the cause of the disease and then actively under the guidance of the physician to avoid delaying the condition.