In 1984, psychiatrist Norman Rosenthal coined the term Seasonal Affective Disorder (SAD). Now 30 years later, BBC looks at the differences between SAD and the winter blues.
Winter blues often involves a lack of sleep while SAD means people are permanently tired and spend longer in bed, she says. Jarvis estimates between 3% and 5% of the UK population might have SAD, with one in eight (12.5%) having the more mundane “winter blues” – a much less well-defined change in mood.
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