Human Beings need light! During the darker months we don't get enough light, and our bodies react accordingly.. Our brain starts to tell us to hibernate, by producing more melatonin, the sleep hormone.. We feel lethargic and lack energy and just want to retreat to our caves... By using light therapy we are telling our brain that summer is here again, and it produces more serotonin which gives us more energy, bringing our body clocks back to normal again. Brighterday are Irelands leading specialists in light therapy and treating the effects of SAD, if you have any questions that couldn't be answered on our site please feel free to call us on 01 2751933