In northern hemisphere during the winter months there is a depression that affects many people while these people feel much better during spring and summer. This is the disorder known as the seasonal affective disorder. The group of people that is affected mainly is the people who live in areas where winter days are very short or when there are big changes in the amount of daylight in different seasons. Sunlight exposure is associated with mood trends and emotional well being.
Sunlight has been considered for years as an important factor that determines the various fluctuations in the mood. There is a mechanism by which sunlight exerts this influence. Once sunlight hits the retina a signal is sent to the nervous system which regulates the production of critical mood transmitters, melatonin and serotonin. If the amount of sunlight that is accepted is minimum then the production of these neurotransmitters is decreased. Except from its beneficial role in mood regulation sunlight is recognized for its contribution to the treatment of anorexia nervosa and epilepsy.
An intense warming sensation can be caused by exposure to sunlight. Sun generates radiant or infrared heat. This type of heat has a direct effect in the body tissues as it penetrates them thus causes a sensational warming sensation. Detoxification and rejuvenation of tissues can be enhanced through the increased circulation.
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