TLDR: Seasonal Affective Disorder (SAD)
SAD is a type of depression linked to winter, when shorter daylight hours and dull weather significantly affect your mood.
Low mood, extreme tiredness, oversleeping, cravings for carbs or sugar, irritability, social withdrawal, and physical issues like joint pain or stomach problems.
Symptoms often begin around September and can last until April, with the darkest months being the toughest.
A lack of daylight can affect brain chemistry and disrupt sleep, appetite, energy levels, and mood.
Light therapy, antidepressants for some people, and support from a GP, who can refer you to NHS SAD clinics or other treatments.
What is seasonal affective disorder?
It is common for dull weather and short daylight hours to dampen your mood. Seasonal Affective Disorder (or SAD) is when the winter weather affects your mood so much that you feel depressed.
What are the symptoms?
- Sleep problems: oversleeping (but not feeling refreshed) and difficulty staying awake, or in some cases disturbed sleep and early morning wakening
- Lethargy: too tired to cope, everything becomes an effort
- Overeating: craving for carbohydrates and sweet foods leading to weight gain
- Depression: feelings of despair, misery, guilt, anxiety, hopelessness, normal tasks become frustratingly difficult
- Social problems: avoiding family and friends, irritability, inability to handle stress, feeling emotionally numb, loss of libido
- Physical symptoms: often joint pain or stomach problems and a lowered resistance to infection
- Behavioural problems: extremes of mood and short periods of overactivity in spring and autumn.
When does it start?
The symptoms tend to start around September and can last until April. They are at their worst in the darkest months.
What causes it?
The exact causes of SAD are unclear – but it is said to stem from the lack of bright light (daylight and sunlight) in winter, causing a biochemical imbalance in the brain. Some people need a lot more light than others for their body to function normally. When light hits the backs of our eyes, messages are sent to our brain which control sleep, appetite, sex drive, temperature, mood and activity. So when the levels of light are low, these functions may slow down.
Who does it affect?
Roughly 2% of the population of Northern Europe suffer badly, with many more (10%) suffering milder cases. Across the world the incidence increases with distance from the equator, except where there is snow on the ground when it becomes less common. More women than men are diagnosed as having SAD. Children and adolescents are also vulnerable.
What treatment is there for SAD?
A perfect cure is going to a brightly lit climate, whether skiing or somewhere hot (any excuse for a holiday!)
Otherwise, exposure to bright light every day by using a light box or a similar bright light therapy device may help. For most people, sitting in front of a light box for between 15 and 45 minutes a day (not staring at the light but allowing it to reach their eyes) will be sufficient to alleviate the symptoms. Some sufferers also need treatment with antidepressant medication.
Should I talk to my doctor?
Yes. They can tell you where the NHS specialist SAD clinics are in the UK, and help you seek treatment.
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