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By comparison, even on the year's shortest day – the winter solstice on Dec. 21 – people in Washington, D.C., will get nearly 9 hours 30 minutes of daylight; in Miami, 10 hours 31 minutes. In Portland, Oregon, it 's 8 hours 42 minutes and in Billings, Montana, 8 hours 40 minutes.
Many find that the season is shorter and longer affects their health. About 5 percent of the population develops depression, according to Mental Health America. Reduced amounts of daylight trigger the milder "winter blues" in another 10 to 20 percent, according to the American Academy of Family Physicians. Seasonal affective disorder, or SAD, affects women far more often than men; 4 out of 5 people with SAD are women. It also affects people under 30 more often than older people. Symptoms include typical signs of depression, such as low energy, sleep problems, changes in appetite and weight, and loss of interest in activities. But with SAD, symptoms come and go with the season. No one knows what causes SAD, but most experts link its development to the sun's rays, brought about by shorter days in the fall and winter. This may be your body's internal clock, sparking depression, and reduce your body's serotonin levels, increasing melatonin levels and decreasing vitamin D levels, affecting your mood. Treatment options include light therapy – in a special light box for 20 to 60 minutes a day – as well as behavioral therapy and possibly antidepressants.
If relocation is an option, consider heading south. The closer you are to the equator, the lower risk for depression.
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