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In a 2010 study of more than 14,000 people in the Netherlands, for example, researchers concluded that weather conditions were not associated with a low mood. And a 2008 study of more than 1200 people in Germany found that the average effect of weather on mood was small, and that both sunny and rainy days were associated with tiredness.
In general, Rohan says, your daily stress, such as from relationships or work, is probably going to affect your mood “much more than the weather forecast”.
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Fleeting feelings of lethargy should not be confused with seasonal affective disorder, or SAD, the experts said. SAD is a type of depression is more common among women than it is among men, and it tends to run in families. Typically, SAD arrives in the fall or winter, and it lingers, regardless of daily weather fluctuations, before finally going away in the spring. (Though you can also experience SAD during the spring and summer months.)
In winter, what triggers SAD is not the overcast days, but the shorter days that result in the sun rising later than it would during spring or summer.
“You’ve got enough light on a cloudy day to treat winter depression, but it’s not at the right time,” says Lewy, who is an expert on internal clock disorders. For most people, the bright light therapy used for SAD should take place in the early morning hours – the closer to wake time, the better, he adds.
It might also be tempting to assume that melatonin, a hormone that helps induce sleep, could contribute to feelings of sluggishness on an overcast day because it’s produced at night and is associated with darkness. But “melatonin is always turned off by the body clock in the morning, even in the absence of light,” Lewy says, so the hormone does not play a role in daytime fatigue.
If you find yourself dragging during the occasional cloudy day, it can help to focus on getting more rest at night and incorporating more energy creating strategies into your day, such as taking movement breaks or focusing on what you eat. It might just be the boost you’re looking for.
The New York Times
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