Seasonal affective disorder
Seasonal affective disorder (SAD) is a specific type of depression that affects people at the same time each year, predominantly autumn and winter. During spring and summer, people with SAD feel well.It is believed that SAD is related to a lack of daylight exposure, which would explain why people feel well during spring and summer and only start experiencing problems when the days get shorter. Some of the symptoms many people experience are, feeling miserable, lacking in energy, being tired, insomnia, food disorders, having low spirits and feeling depressed.