As the weather turns colder and days get shorter, it’s common to feel a little off. Maybe you miss leaving work when the sun’s still out. Or maybe you just miss baseball season. But according to Nada Milosavljevic, M.D., J .D., a faculty member at Harvard Medical School, it could be more serious than that.

Seasonal affective disorder (or SAD) is a subtype of depression that affects between one and 10 percent of the U.S. population each year. SAD can strike anyone, so to help you recognize the symptoms and set yourself up for a happier winter, here are the good doctor’s top tips for fighting SAD.

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