LED Daylight Lamp PORTABLE, LIGHTWEIGHTSeasonal Affective Disorder (SAD) refers to a type of depression caused by changes in the seasons. People with SAD can suffer from depression, extreme tiredness, drowsiness, and changes to their appetite which can result in weight gain. SAD is more common in autumn and winter due to the reduction of sunlight. This reduction may disrupt your body's internal clock and lead to SAD symptoms, also known as "winter depression". Studies point to a reduction