As the days get shorter and temperatures drop, many people start to feel a noticeable shift in their mood, a condition known as seasonal affective disorder.

This type of depression -- commonly known as SAD -- happens around the same time every year, most often in the fall and winter, when sunlight is limited.

Having the right tools can make a big difference in how you feel during these months, Stephanie Marcello said in a news release.

Marcello is chief psychologist at Rutgers University Behavioral Health Care in New Brunswick, New Jersey.

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