Hyperthyroidism is mainly characterized by hypermetabolism, mostly with increased excitability of the nervous, circulatory and digestive systems, but usually does not lead to drowsiness. Hyperthyroidism is caused by excessive thyroid hormones in the blood, resulting in a series of high metabolic clinical manifestations, the main symptoms include irritability and insomnia, agitation, fatigue and palpitations, fear of heat and excessive sweating, hyperphagia, lethargy, increased frequency of stools or diarrhea. Female patients may also experience scanty menstruation, and men can see hyperthyroidism circumscription. Due to the increased excitability of the nervous system, the performance of drowsiness does not usually occur. If hyperthyroidism patients appear sleepy performance, should promptly seek medical treatment, do not delay, so as not to cause adverse consequences.