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春困是因自然界气温回升而产生的一种生理现象。寒冷的冬季,受低温影响,人体皮肤汗腺收缩,保持体温恒定。进入春季,气温升高,皮肤毛孔舒展,供血量增多,供给大脑的氧相应减少,易发生困乏。另外,冬季里紫外线及阳光照射不足,机体内缺少维生素D,也会导致春天来临的时候,身体功能大多处于半昏睡状态。很多人认为,只要多睡就不会发困。其实不然,成人每天睡8小时就可以了,睡太多,会越睡越
Spring storm is a physiological phenomenon caused by the temperature rise in nature. Cold winter, affected by low temperature, sweat gland contraction of human skin, to maintain constant body temperature. Into the spring, the temperature rises, the skin pores stretch, increased blood supply to the brain to reduce the corresponding oxygen, prone to sleepy. In addition, the lack of UV and sun exposure in winter, the body’s lack of vitamin D, will lead to spring when most of the body functions in a semi-lethargic state. Many people think that as long as more sleep will not sleepy. In actual fact, adults sleep 8 hours a day, sleep too much, will sleep more