我第一次听到 seasoning depression 这个词的时候，是从一个 undergraduate 的口里，我描述着自己自从入秋之后昏昏欲睡，无精打采的状态。诧异于为什么短短一周时间从变成了另一个人.

Seasoning depression 其实不是准确的定义，学术的定义叫做 Seasonal Affective Disorder

这个名字都很有意思，简称 是 SAD :(

https://www.hopkinsmedicine.org/health/conditions-and-diseases/seasonal-affective-disorder 描述了下面一些症状：

Increased sleep and daytime drowsiness

Loss of interest and pleasure in activities formerly enjoyed

Social withdrawal and increased sensitivity to rejection

Grouchiness and anxiety

Feelings of guilt and hopelessness

Excessive tiredness (fatigue)

Decreased sex drive

Decreased ability to focus

Trouble thinking clearly

Increased appetite, especially for sweets and carbohydrates