EDISON - For some people, the winter months can be emotionally daunting. For some, they can be downright draining and lead to an affliction known as seasonal affective disorder.

Psychotherapist Maria Misito-Kloss says nearly 3 million people are dealing with the disorder this winter. She says it is a “chemical imbalance in the brain prompted by shorter daylight.”

“Typically they are feeling sad, they are feeling depressed and they are feeling like they don't want to get out of bed,” Misito-Kloss says.

Misito-Kloss and other medical experts say the disorder can be treated.

"Seasonal affective disorder is a vitamin D deficiency,” says News 12 New Jersey’s Dr. Derrick DeSilva.

Misito-Kloss and DeSilva say the disorder can be treated with vitamin D supplements, light therapy and even exercise. They also suggest that people should try to go outside when possible.

"Don't you feel better when you're out in the sun and in the summer?  Why do you feel like that...it's the vitamin D,” says Dr. DeSilva.

Doctors say seasonal affective disorder generally picks up in fall and ends in early spring.  Cases spike in winter.