Seasonal Affective Disorder, or SAD, is officially recognised by Doctors and Psychiatrists as a medical condition that is thought to affect 2 million people in Great Britain.

In the beginning man only worked and lived outdoors in full natural daylight. At the turn of the 19th century 75% of the population worked outdoors. Now less than 10% of the population work in natural outdoor light. This change has resulted in a dramatic increase in light deficiency symptoms.

Symptoms include:

• Depression, feelings of gloom and despondency for no apparent reason


• Lethargy, lacking in energy, unable to carry out a normal routine


• Anxiety, inability to cope


• Social problems, irritability, not wanting to see people


• Sleep problems, finding it hard to stay awake during the day, but having disturbed nights


• Loss of libido, not interested in physical contact.


• Craving for carbohydratesand sweet foods, leading to weight gain