The days are getting shorter and colder and we're on our way towards winter. And if you aren't feeling like yourself during the change in seasons, you aren't alone.

The National Institute of Health says millions of Americans may suffer seasonal affective disorder during this time.

The symptoms usually start in late fall or early winter and go away in the spring. You may end up feeling sad for short periods of time or not like your usual self.

Dr. Megan Nolan, from St. Peter’s Internal and Family Medicine, joins Spectrum News 1 and says a lot of people throw around the term Seasonal Affective Disorder without actually getting the diagnosis. She also talks the winter blues, tell-tale signs of SAD and what we can do to combat it.