Many people eat and sleep a little in winter and hate dark mornings and short days. This is called "winter blue". Others have more serious symptoms such as sleep disorders, withdrawal symptoms, binge eating, depression, anxiety, and lethargy. These often lead to family, work, and relationship difficulties. This is a perceived problem called seasonal affective disorder (SAD).
SAD is caused by a lack of bright light in winter. The light that enters our eyes stimulates our brain and controls our daily rhythm through the production of hormones. For some people, winter does not have enough light to regulate the hormones that prevent us from getting up and sleeping, being energized, and depressed.
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