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Seasonal Affective Disorder (SAD)

Seasonal Affective Disorder (SAD)

Seasonal Affective Disorder (SAD) is a type of depression that follows a seasonal pattern, most commonly occurring during the autumn and winter months when daylight hours reduce. Some people notice their mood and energy improve during spring and summer, whilst symptoms return at a similar time each year.

 

SAD can affect mood, motivation, sleep, concentration, and day-to-day functioning. Whilst many people notice a mild change in mood during darker months, SAD involves symptoms that are more persistent and significantly impact emotional wellbeing and daily life.

What can Seasonal Affective Disorder feel like?

SAD can affect emotional wellbeing, physical health, thoughts, and behaviour in different ways.

 

Emotional experiences

  • Persistent low mood

  • Loss of interest or enjoyment

  • Irritability or frustration

  • Feeling emotionally flat or numb

  • Hopelessness or sadness

 

Physical symptoms

  • Fatigue or low energy

  • Sleeping more than usual

  • Difficulty waking in the morning

  • Increased appetite, particularly cravings for carbohydrates or sugar

  • Reduced motivation and physical sluggishness

 

Cognitive experiences

  • Difficulty concentrating

  • Brain fog or slowed thinking

  • Negative thinking patterns

  • Reduced confidence or self-esteem

 

Behavioural changes

  • Withdrawing socially

  • Reduced productivity or motivation

  • Spending more time indoors or isolated

  • Difficulty maintaining routines

For some individuals, symptoms can become severe and may also include anxiety or suicidal thoughts.

What causes SAD?

The exact causes of SAD are not fully understood, but research suggests it may be linked to reduced exposure to daylight during darker months. Reduced sunlight may affect:

  • The body’s internal sleep-wake cycle (circadian rhythm)

  • Serotonin levels, which influence mood

  • Melatonin production, affecting sleep and energy

 

Some people may also be more vulnerable to SAD due to family history, previous depression, chronic stress, or other mental health difficulties.

How common is SAD?

Seasonal changes in mood are relatively common, particularly in countries with reduced winter daylight. However, SAD involves symptoms that are more significant and persistent than typical “winter blues.”

 

Research suggests that SAD affects around 2–5% of people in the UK, with milder seasonal mood difficulties affecting many more individuals. Women and younger adults appear to be more commonly affected.

What treatment do can offer?

Treatment and support often focus on improving mood, increasing routine and activity, and reducing the emotional impact of seasonal changes.

 

Cognitive Behavioural Therapy (CBT)

CBT is one of the most evidence-based psychological treatments for SAD and may help by:

  • Challenging negative thinking patterns

  • Increasing motivation and behavioural activation

  • Reducing withdrawal and avoidance

  • Developing coping strategies for seasonal changes

 

Behavioural and lifestyle support may include:

  • Increasing exposure to natural daylight

  • Maintaining regular sleep and waking routines

  • Gentle physical activity or movement

  • Planning enjoyable or meaningful activities during winter months

  • Staying socially connected where possible

 

Compassion-Focused Therapy (CFT)

CFT can support:

  • Managing self-criticism linked to reduced productivity or motivation

  • Developing self-compassion during difficult periods

  • Reducing shame or frustration about symptoms

 

Acceptance and Commitment Therapy (ACT)

ACT focuses on:

  • Making space for difficult emotions

  • Reconnecting with values and meaningful activities

  • Reducing struggle with seasonal changes in mood or energy

Light therapy

Some individuals find light therapy helpful. This involves using a medically approved light box that mimics natural daylight, usually during the morning months of reduced sunlight. Light therapy may not be suitable for everyone, particularly individuals with certain eye conditions or bipolar disorder, so professional guidance is recommended.

A compassionate note

People experiencing SAD often criticise themselves for struggling with motivation, energy, or mood during winter months. In reality, Seasonal Affective Disorder is a recognised mental health condition that can have a genuine impact on emotional and physical wellbeing.

 

With the right support, many people find ways to better understand their symptoms, reduce the impact of seasonal changes, and develop supportive routines that improve wellbeing throughout the year.

Further support and resources

You may find these trusted resources helpful:

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