(STLMoms) – Do you have cabin fever? Is the cold outside affecting your mood? Psychotherapist Dr. Russell Hyken talks about how winter can get even the best of us a little down. The brain chemistry is altered by cold weather and those shorter days. Melatonin and serotonin are hormones that play a part in controlling moods, energy levels, and sleep. But when the seasons change, some people experience SAD or Seasonal Affect Disorder Snow days can actually cause `more` stress and worry to somebody who`s experiencing a low mood.