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The day is over, which means it's time to take some stock. Most likely, the person spent the day unconsciously, spent it without benefit, or made a lot of people unpleasant. In the evening, all the memories come back from the routine, and it becomes sad from all that has been done, which today can not be returned and not redone.
I will try to answer from the point of view of physiology, for which I will take the disadvantages, but I hope that representatives of this science will also answer in more detail and accurately. In my opinion, this is due to the hormone melatonin, its secretion is related to the amount of light, the less it is, the stronger the secretion of melatonin, since one of the functions is to regulate the sleep/wake mode. But the increased content of this hormone can inhibit the secretion of gonadotropins, which, in turn, are the main ones in the regulation of the sex glands. As a result, a decrease in the concentration of sex hormones can affect the mood in a negative way, causing the same sadness.
I can assume that in the evening people are far from all the everyday bustle and routine, they just don't have time to think about any other things than vital ones that are necessary here and now (study, work, urgent trip to the store, etc.). and when the evening comes, people return home and start (not) consciously analyzing the past day, and there they don't notice how they start to stir up memories of long-past days, and from there, perhaps, there is sadness and longing, sometimes nostalgia