Winter Light

Evidence suggests light (or lack thereof) during the winter months can contribute to depressive symptoms.
Why light? Because light affects serotonin, a hormone / neurotransmitter that helps regulate mood, emotions and behavior.
Less sunlight / daylight in the winter months can mean less serotonin, which can cause problems with energy and mood.
The solution: Try to get outdoors as much as possible when weather permits, particularly during sunny winter days. Think about it from more than a biochemical perspective: Being outside on a sunny day always seems to make people feel better compared to sitting inside.