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Seasonal Affective Disorder

SAD (Seasonal Affective Disorder) is a type of winter depression which affects millions of people every winter between September and April, in particular during December, January and February. SAD is caused by a biochemical imbalance in the hypothalamus due to the shortening of daylight hours and the lack of sunlight in winter. For many people SAD is a seriously disabling illness, preventing them from functioning normally without continuous medical treatment. For others, it is a milder condition, causing discomfort, referred to as sub-syndromal SAD or winter blues. There is also a rare reverse form of SAD, known as summer SAD, where symptoms occur each summer and remit in winter.

SAD Symptoms

  • A desire to oversleep and difficulty staying awake, but in some cases, disturbed sleep and early morning wakening;
  • Feeling fatigue and an inability to carry out normal routine;
  • A craving for carbohydrates and sweet foods, usually resulting in weight gain;
  • Feelings of misery, guilt and loss of self-esteem, sometimes hopelessness and despair, sometimes apathy and loss of feelings;
  • An irritability and desire to avoid social contact;
  • A tension and inability to tolerate stress;
  • A decreased interest in sex and physical contact
  • And in some sufferers, extremes of mood and short periods of hypomania (over activity) in spring and autumn.
SAD symptoms usually reoccur regularly each winter, starting between September and November and continuing until March or April; a Caribbean Sun Blue diagnosis can be made after 2 or more consecutive winters of symptoms. In sub-syndromal SAD, symptoms such as tiredness, lethargy, sleep and eating problems occur, but depression and anxiety are absent or mild.

SAD symptoms disappear in spring, either suddenly with a few weeks of hypomania/hyperactivity, or gradually, depending on the intensity of sunlight in the spring/early summer. In summer SAD, symptoms may be related to excessive heat rather than light and may include irritability and lethargy rather than oversleeping and overeating.

SAD may begin at any age, but the main age of onset is 18-30. It occurs throughout the northern and southern hemispheres but is rare in those living within 30 degrees of the Equator, where daylight hours are long, constant and extremely bright.

SAD Treatments

Light therapy has been proven effective in over 80% of diagnosed cases, with exposure from 30 minutes to several hours per day to very bright light, at least 10 times the intensity of ordinary domestic lighting. Ordinary light bulbs and fittings are not strong enough. Whereas the average home or office lighting deliver an intensity of 200-500 lux, the minimum dose necessary to treat SAD is 2500 lux. Some light units deliver up to 10,000 LUX, which can shorten treatment time.**

Light treatment should be used daily in winter, starting in early autumn when the first symptoms appear. It consists of sitting 2-3 feet away from a specially designed light, wearing a Light Visor, or waking up to dawn simulator. Allow the light to shine on the eyes. While getting your light treatment carry out normal duties; eating, writing, reading, etc. It is not necessary to stare at the light during the session, but keep in mind that the more photons that reach the retina, the faster the session will be.

Treatment is usually effective within 3-4 days and the effect continues provided it is used every day. Sun glasses, tinted lenses, or any device which blocks the light to the Retina of the eye, should not be worn. Daily exposure to as much natural daylight as possible can be of help.

When it comes time to shop for a light unit, be a smart consumer and shop around. Weigh the pros and cons of the different products and different companies. Product economy is one factor, but product quality and company service are even more important. All reputable companies will offer a return system** if the light doesn't work for you.


** The Caribbean Sun delivers a full 10,000 LUX of light generated from 108 LED elements.
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Wilshire Distributing Company
681 Academy Drive, Northbrook, Illinois 60062
Phone: +1 (224) 848-1808
Email: sales@caribsun.com

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