If the individual did not experience it for long time. Despite the exact cause of (SAD) is still unclear, however numerous theories talked about why some people are more vulnerable to (SAD) than others. Some studies highlighted the cause of (SAD) by the absence of the Sunlight and changing in the weather that affect people’s thoughts, behaviours and feelings as this may has a much greater effect on our mood, energy levels and our behaviours which leads to symptoms of depression with a significant impact on our day -to -day life. This is very common in Scandinavia, Europe, North and South America, North Asia and in Southern parts of Australia. However, people living in UK may experience symptoms between September and November which may continue until March/ April, some others may experience the symptoms for long time depending on individual’s type of career, social and family’s circumstances. WWMIND Resources (2017).