Researchers have found that SAD is caused by, among other things, a lack of serotonin and of vitamin D, which is most commonly delivered through exposure to sunlight. Shorter days and fewer hours of sunlight in autumn and winter can have varying effects on a person's mood, ranging from simply feeling down during cold or cloudy weather to having extended, seasonal symptoms like depression, lethargy, and anxiety. Many researchers have distinguished seasonal mood variations - which we see, for example, with SAD - and daily mood variations. Consistent environmental conditions put less stress on the body - it doesn’t have to adjust to fluctuations in temperature, barometric pressure, and humidity, for example. Sunny days tend to be more meteorologically stable, with fewer extreme weather shifts than cloudy days.People tend to have higher serotonin levels on bright, sunny days than on gray days.Sunlight is essential to our body’s production of vitamin D, which affects mood.People are more likely to get outdoors and engage in fun activities when it’s sunny.Some of the factors that may account for our general impression of being happier when it’s sunny include: In other words, there’s a lot more to being happy in sunshine than the presence of sunlight. However, once they accounted for other weather variables (like barometric pressure, humidity, and temperature) as control factors, the connection between sunlight and mood became weaker. Researchers have found that a significant number of people report feeling happier when the weather is sunny. Common sense suggests that people are happier when the sun is shining, but researchers who dug into this have often been surprised to find that sunshine on its own generally has little to no effect on mood. The short answer is yes, but there are many factors that determine the degree to which this is true. But does science? A growing body of evidence suggests that might be the case. Whether they’re only happy when it rains or prefer walking on sunshine, most people will tell you that the weather affects their moods - even the songs we listen to confirm it.
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