Light therapy
has proven effective in up to 85% of diagnosed SAD cases
Treating Seasonal Affective Disorder
Seasonal Affective Disorder, or SAD, is a type of winter depression that affects an estimated half-million people between September and April, and particularly during the months of December, January and February. It is triggered by a biochemical imbalance, caused by the shortening of daylight hours and the lack of sunlight in winter.
For some, SAD is a mild but debilitating condition causing discomfort but not severe suffering. For others, however, it can be a seriously disabling illness that prevents normal functioning without continuous medical treatment. Special lighting products have shown positive results in treating this disorder.
How does SAD affect people?
- Sleep problems: desire to oversleep and difficulty in staying awake; in some cases, disturbed sleep and early morning wakening
- Lethargy: feeling of fatigue and inability to perform normal routine
- Overeating: craving of carbohydrates and sweet foods, usually resulting in weight gain
- Depression: feelings of misery, guilt, loss of self-esteem, hopelessness, despair, apathy or loss of feelings altogether
- Social problems: irritability and desire to avoid social contact
- Anxiety: tension and inability to tolerate stress
- Loss of libido: decreased interest in sex and physical contact
- Mood swings: extremes of mood combined with short periods of hypomania (over activity) in spring and autumn
- Physical symptoms: joint pain, stomach problems or lowered resistance to infection
- Behavioral problems, especially in young people
Who does it affect?
SAD may begin at any age, but the typical time of onset is between 18 and 30 years.
What treatment is available?
Light therapy has proven effective in up to 85% of diagnosed SAD cases. Light therapy is described as exposure to very bright light – at least ten times the intensity of ordinary domestic lighting – for up to four hours per day (average is one to two hours).
The light used in light therapy is produced by a light box or similar bright-light therapy device. The user does not have to stare at the light, but can watch television, read, or engage in other activities that do not interfere with the ability of the light to reach the eyes.
What is different about lights used for SAD treatment?
Lights used for treatment of SAD must be adequately bright – at least 2500 lux, which is five times brighter than a well-lit office. Treatment lights which are brighter will produce the desired effect more quickly.