The fall-winter emotional drop is experienced by most people, and as you state, less daylight seems to influence it. But it might be our evolutionary cycle in general. This time of year keeps us indoors more, makes us more sedentary, and I think gives us the feeling we have fewer choices to express our need for freedom. Add in the generally colder weather, the rain, snow, the demand to drive, walk and live in more challenging circumstances -- it all contributes to a less "cheery" response to life. Even depression.
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