孟浩然《春晓》云“春眠不觉晓,处处闻啼鸟。”春天,本是大地复苏、万物蓬勃的美好季节,作为万物之灵的人类却出现“不觉晓”的反常现象,这是何故?我们知道,人的生理活动与外界是有关联的。冬天,人们受到寒冷的刺激,皮肤毛细血管处于收缩封闭状态,血流量减少,皮肤就像一堵挡风的墙,抵御着寒冷,减少热 Meng Haoran “Chunxiao” cloud “Spring sleep not knowing Xiao, everywhere smell the birds.” Spring, the earth is recovering, all the wonderful season of things, as the human spirit of all things but there is “unknowing” anomaly, which is why We know that people’s physical activity is related to the outside world. In winter, people are stimulated by the cold, the skin capillaries in a closed state of contraction, blood flow decreased, the skin is like a wall of wind, to resist the cold, reduce heat