The differences between Seasonal Affective Disorder and the winter blues

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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