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春困是由于季节转换给人们带来生理变化的一种反应。寒冷的冬天,人体受到低温的影响和刺激,皮肤毛细血管收缩,血液流量相对减少,汗腺和毛孔也随之闭合。进入春季后,随着气温的升高,人的身体毛孔、汗腺、血管开始舒张,皮肤血液循环也旺盛起来。这样一来,供给大脑的血液就会相对减少;随着天气变暖,新陈代谢逐渐旺盛,耗氧量不断地加大,大脑的供氧量则显得不足了。再加上暖气温的良性刺激,使大脑受到某种抑制,因而人们就会感到困倦思睡,总觉得睡不够。
Spring Sleepy is a response to the physiological changes brought about by seasonal changes. Cold winter, the body affected by low temperature and stimulation, skin capillary contraction, the relative reduction of blood flow, sweat glands and pores will also be closed. Into the spring, with the temperature rise, the human body pores, sweat glands, blood vessels began to relax, the skin blood circulation is also thriving. As a result, the blood supply to the brain will be relatively reduced; as the weather gets warmer and the metabolism is getting stronger and stronger, the amount of oxygen consumed continues to increase, and the amount of oxygen supplied to the brain becomes inadequate. Coupled with the warm stimulation of warm temperatures, the brain by some inhibition, so people will feel sleepy sleepy, always feel sleep enough.