“已觉秋窗愁不尽，那堪秋雨助凄凉”，《红楼梦》中林黛玉的这两句诗，写尽了秋日的凄凉和忧愁。的确，秋风秋雨使人愁，并不完全出于审美和心理方面的原因，还有一定的生理原因。现代医学研究证明，在人的大脑底部，有一种叫松果体的腺体，能分泌出一种褪黑激素。这种激素能 “I feel autumn windowsill endless, N 堪 秋雨 help desolate,” “Dream of Red Mansions” Lin Daiyu these two poems, wrote the autumn’s bleak and sad. Indeed, the fall of autumn makes people worry, not entirely out of aesthetic and psychological reasons, there are some physiological reasons. Modern medical research shows that at the bottom of the human brain, there is a gland known as the pineal gland that secrete melatonin. This hormone can